Yep, I would say speaker building is a lot like furniture building. You could actually argue it's a special case of furniture building.I agree, my 100 litre horn system cost me peanuts but once you go normal the more competition the DIY solution has. And that probably answers my question, within a few years will probably find an affordable 3 way with a Coax and two 8 inch woofers that measures supremely well.
Do you just want a normal table or chair? Unless you already have the wood and the tools you're going to come out break even at best doing DIY, minus weeks of your life.
Do you want a completely custom piece of furniture, or just something really big and unusual? DIY might get you there for 1/10 the cost.