Bigger machines, and recipies
So I may have bitten off a bit more than I can comfortably chew with what I've termed "Multimachines". Basically a larger version of the current "StampyThing", they're machines composed of more than one block, with sub parts so that you can identify them. When they're arranged in the correct fashion, the Multimachine activates and starts producing stuff.
Of course, all this needs configuration and arranging and so on, plus you need to detect when a multimachine's configured, keep all the sub parts in the right spot when updating, only accept items in particular spots, output in particular spots, etc. etc.
Stopping to make dinner now, we'll see how far I can get tonight without going too mad. It's a bigger job than I thought going in, but then it usually is, isn't it? :P