Here is my principal idea its a mod that add a machine that autoconstructing different building (farm, house, church, castle ... there is thousand of community build) that can be selected through it. But you NEED to feed him the all the material needed like wood, stone, glasse, iron bar, carpet, etc, etc. Like a basic house can need 100 wood, 100 stone, 50 glass when an end game building like a cathedral need 10000 stone 5000 wood etc. So you need to build machine or grind the material and a lot of RF for the building so its not OP. Therefore you need to prepare the terrain to receive it and put landmark. I like the idea that this block bluid like the Filler block of buildcraft i think throwing all the block while the building occures.
I would like a mod like that because i dont have great building skill and i like using tech mod a lot so use those to grind my material for my build and once the buliding is finish i can modify and decorate it my way seem really fun.