Morning Andy.

My first advice is to run away now before the bug bites because if you think Kit cars are expensive playthings then CNC machines can match them pound for pound and the CNC bug infects you faster than Covid...

That said it's a great thing to get into and can take you down paths you never even thought about, I have dozens of customers who are testimony to this where they buy a machine with this or that intention in mind, and very quickly after using the machine they start to realize just what a CNC machine can do and next thing it's taken them off at complete tangents and down paths they never expected.
Many of whom have built up very healthy businesses doing things they love doing.

Last advice is if planning on building, or buying a machine for that matter, DONT BUY ANYTHING without asking advice or until you 100% are sure it's correct for the application. Rushing out and buying kit or machines in the excitement or after a few two many cans is the #1 mistake new users make.

If you stay enjoy the ride and hang on because it can get bumpy, but fun and very rewarding.