It is a modular tree farm, with saws, the sawdust/logs etc go down and are collected by minecarts (yes, it was quite difficult to iron that out well), and are brought back up again to be processed. Wood goes into another building, sawdust goes for potash, apples go bye bye, saplings are re-routed back into the system.
What I'm having more difficulty is in building this thing from the bottom up. The tree farm is made, the cart collection is also made, but I'm sort of stuck now on the unloading / sorting part, as building the "wrong way round", i.e. starting from the last step, is confusing in terms of spacing.
Here are a couple pics, the first is the tree part, and the second is the are above where I'm supposed to be building the storage area, etc.
Spoiler
Show
So, just post some advice and pictures from your own constructions. Share and enjoy. And free candy for the ones who get the reference.