The Meaning of Life, the Universe, and Everything.
There are several mods out there which add pipes/conduits for transporting items, fluids, power, and information (redstone signals).
There are also mods out there which let these same things be transported "wirelessly" from a transmitter block to a receiver, without imposing any limit whatsoever on distance or angle to the receiver, and without needing to have any special blocks between transmitter and receiver.
The first of these can be tedious, the latter can be a little bit overpowered, and in my opinion, just a little bit un-minecrafty.
This idea is to use lasers for transmitting things. The laser beam itself will have infinite carrying capacity; the blocks which transmit and receive it have limited capacity.
The main block of the mod would be the Laser Omni Block. It shoots one laser beam directly north, south, east, west, up or down.
To be useful, the beam must strike another Laster Omni Block (or LOB).
Each LOB can be given an upgrade to allow it to move power from adjacent blocks into the laser beam it is transmitting.
Each LOB can be given an upgrade to allow it to move power from the beam it is receiving into adjacent blocks.
Each LOB can be given an upgrade ... for items, for fluids, for redstone signals.
If a Laser Omni Block receives a beam with stuff it doesn't process, it will automatically (for free) retransmit this stuff to whatever Laser Omni Block it is pointing at.
The laser beam, at low power, is harmless, and usually invisible, and usually silent.
When you place down a LOB, it makes a visible laser, and scans "forward" until it reaches a block that is neither air nor glass, or until it's reached its maximum range. If the laser has *not* reached another LOB, it makes a laser-y sound to let you know that it did not connect, and schedules another scan in several seconds.
After the LOB has connected itself via laser beam to another LOB, it does no regularly scheduled scans. Instead, it scans (and makes a visible beam) when it receives a block update, or a random block tick, or when the LOB it is connected to is broken or gets a block update. These additional scans only make laser noises if the beam is blocked or unable to reach another LOB.
When a laser beam is transmitting above a certain amount of energy per tick, it will be always be visible. At a slightly higher energy per tick, it produce an ominous hum, and will do damage to players and mobs, with more power doing more damage, and producing a louder hum.
Power, Items, Fluids, and Redstone signals can be sent through the laser beam on different named channels -- the default is "Main".
Redstone signals being sent into the laser don't *have* to come from the LOB being redstone powered, the block can, with the right upgrade, take a comparator output from an adjacent block. Likewise, the LOB can be upgraded to produce a signal which only a comparator can see.
If a LOB is receiving a redstone signal through a laser beam coming into it, and is sending a redstone signal on the same channel in it's output laser beam, this output signal can be configured to replace, add to, subtract from, or be subtracted from, the input signal.
Also, there would be an upgrade which allows an LOB to look into the inventory of an adjacent block, and look for specific items, and send a redstone signal into it's output beam, depending on how many there are.
When a LOB has been configured to take items from it's incoming laser beam(s), and push them into an adjacent block, it can be further configured to only do this if it receives a redstone signal, either an external vanilla redstone signal, or an on-the-beam redstone signal on a named channel. This also applies to pulling items from inventories to send them into the beam, and for fluids.
The most useful arrangement of Laser Omni Blocks, is for every block in your base which generates or consumes power, or generates or consumes blocks, or generates or consumes fluids, it a LOB next to it, and for their beams to form a sort of directional loop.
Additional blocks in the mod would be 45 degree mirrors, and an upgrade crafter, and a network monitor.
The network monitor allows LOBs to be remotely configured, including adding or removing upgrades.
Due to the sheer number of upgrades I'm envisioning, there would also be a parts bag item. This bag can hold any items from the mod, and, equally importantly, when the player is interacting with any LOB or with the network monitor or with the upgrade crafter, the inventory of the bag, as well as the player's inventory, is shown.
The laser beams should be able to shoot through the nether portal, in either direction.
Recipes for upgrades should require items which, in vanilla, are either non-renewable or not super common, such as ores or lily pads.
However, the base upgrades to increase the beam distance, or the amount of power/items/fluids which can be added into or pulled out of the beam, should not be crazy expensive, per upgrade item, either. This can be easily handled by one recipe giving several of that type of upgrade. Furthermore, more potent versions of these should craftable directly from 9 of the lower tier version, and should be downcraftable also, so they can be stored in compacting drawers. Each higher tier is 8 times better than the one before it. A level 10 power transfer upgrade will allow over a billion energy per tick to be moved into or out of the laser beam. That's almost enough to handle the output of two well tuned Draconic Reactors. There should probably also be shortcut recipes to allow high-tier upgrades to be crafted directly using more expensive materials, due to how long it might take to make them from lower tier ones.
Also, the Laser Upgrade Crafter block can be upgraded, to increase the number of upgrades produced per recipe.