I have a sugeshon too: what if you could combine build slots, and you could combine furnaces and steam turbines into one bigger. lv 1 furnace/turbine will use 1 block, lv 2 will use 2 blocks, lv 3 will use 4 blocks and soo on. 1 lv 1 furnace fill heat 3 lv 1 turbines, 1 lv 2 furnace fill heat 3 lv 2 turbines and soo on. That would be cool.
P.S I love this game!