I can somewhat see your point there, but I have a couple of questions:
1. if you're so intent on keeping it as compact as in that picture, what do you have against using MV conveyor modules? (seems like being able to do that with only LV conveyor modules might affect game balance) or electric furnaces, which can be set to auto-output the result items without even needing conveyor modules?
2. Presuming you're using those steam furnaces to make charcoal to power that large boiler, how are you supplying the wood to them? The front side and the vent side need to be kept clear, it looks like they've each got one side occupied by the pipe providing steam and one occupied by the pipe using conveyor modules to pull out the charcoal, and most have another furnace above and/or below, making the top and bottom unavailable for accepting wood.
1. I don't have MV yet on the server yet :p
From a balance perspective I'd say it's not imbalanced because the conveyor modules should do what they describe and more compact designs should be rewarded with lower material costs. I have and am considering switching to electric furnaces. While less efficient it would eliminate a lot of these headaches and allow for easy scaling up to multiple boilers (only 3-4 necessary per boiler).
2. On the server wood is made by a opencomputers robot spruce tree farm using TiC lumber axes. There's more wood from that than any other tree farm I've seen. It's going to a locked JABBA barrel with an LV conveyor module (import)/electrum item pipe running down the middle of the furnaces. Each furnace has a conveyor module facing it configured to import allow export. At the other end of the item pipe is a locked JABBA barrel of charcoal that pumps into the boiler. Steam is fed through 2 corners while exhaust comes out the other two. I figured that image summed the design up fairly well. Here's the layout.
S = steam pipe
I = item pipe
E = exhaust
F = furnace
S F E
F I F
E F S
Barrel design best design (for few input/output requirements).
Also blood asp my friend and I will take a look.