Chisel goes wonderfully with mods like Malisis Doors, Microblocks, and Carpentry. You can build basically anything with those.
More green stuff would probably come from Natura and Biomes O Plenty. I recommend configuring BoP a lot (turn off a lot of the extra biomes) to give the world the feel you want.
Extra food recipes can come from Cooking for Blockheads and Pam's Harvestcraft, together they form a ton of new food recipes and a proper kitchen. Add Hunger Overhaul to make it more hardcore and realistic, and to encourage variety in food.
"Possible machines" is the most uncertain one. There are a huge number of tech mods, and deciding which ones you want to play with, and how central to the game they will be, is not an easy task.
MineFactoryReloaded and ThermalExpansion allow you to automate pretty much everything. Applied Energistics gives you unlimited storage. Progressive Automation and ImmersiveEngineering provide ways to automate things without your machines looking too high tech. Imo, you don't really need any tech mods at all to enjoy minecraft unless your modpack has quests based around automation.
And finally, what do you want the goal of the pack to be? Adventure? Building? Mining? Slaying bosses? Completing quests? Building a factory that can generate any item?