Hi there

I usedto have a carting track so i get some of your needs, we used to pay a local firm to make the parts we wanted.

To save you a bit of reading and headscratching. direct your reading to the following directions.

1. Your spindle needs to be powerful enough to cut them materials at low speed but high torque. ( just meens matching your spindle to your needs when you purchase ). You will probebly find most ebay spindles to fast

2. You should be able to easly beat the resolution your looking for ( accuracy ) with a basic machine.

Some other point to consider.

You can build the cnc parts you need, on top an old machine, if you can find a good old fixed router machine that will run the router at the speeds and power you need, you can fit the XYZ to that. But, building your own new is relatively easy.

Depending on your table design, you could add a cheep plasma cutting head to it for the few times that it would be usfull, then have a spindle head for cutting/milling or other needs.