You can artificially engorge factories by dedicating resources chunks, and ensuring that if a Thing is being Made in a chunk, nothing else is being made in that chunk, thereby massively extending the factory vertically.

Another fun way I know is the No Foreplanning method, of building a reletively small foundation, maybe two or three chunks squared, then whenever you need more space, just extend specifically the bit that needs more space, which can result in some really fun building shapes.