Usually it's the box that is hard to make. A strong, non resonating speaker cabinet takes a lot of bracing and wood working skills. Perhaps consider an open baffle type.
DIY Speaker Kits, a good idea?
Looking at the high quality of drive units in DIY loudspeaker kits like from Madisound, GR Research, SEAS, etc., it easily looks like a sonic bargain.
However, the typical audiophile mantra is to demo for yourself to find what subjectively “resonates” with you. Can’t do this with a kit. But a kit could be a sonic jackpot for one on a tight budget. Also seems fun to build.
What’s your opinion?