Yes, I know this has probably been suggested in various forms at least a dozen times, but anyway. Simply, a 2x2x2 block that holds 4 stacks of 20 chunks (80 chunks total) and can accept/dispense chunks from any of the 16 attachment points on the sides (the four adjacent faces to the top/holding pad thingy). This allows for much more compact factories, as well as being useful in multilayered factories. There should also be a 4x4x2 silo that holds 16 stacks of 20 chunks (320 chunks total), for added space efficiency. Like the previous one, conveyors can connect to the resources on any of the 32 attachment points on the sides. However, the capacity of these silos comes at the cost of extreme weight (for GeoCorp blocks standards; they should be at least 4 times the density of Hawkeye blocks), so they are very difficult to transport on a mobile tech, but they do still function while unanchored.