Looks like a cool hobby machine....but 5" of z will run out quick. No enclosure means coolant all over, 3k of rpm isn't much, without quick change tooling you'll be limited to one tool per program. Some big drawbacks with that machine.
I don't mean to stomp all over your idea but your money, especially 12k is probably better spent other places.
For that much coin you can get a full size used VMC in working condition/ great condition if you look around.
If you don't have the room then I'd look at converting a Bridgeport or clone, more rigid, more rpm, power the knee and your z travel limitation is fixed.
I converted a Rong Fu, and a Taig wasted a lot of money, it was a good learn, but if I had to do it over again I would not go the bench top CNC route.