new to the forum, and to benchtop CNC'ing.

i work in an aerospace machine shop, just got into the industry 6 months ago. i'm currently an operator on a Mazak Vortex 1400/160-II, i'm pretty much just doing setups and pressing the GO button and letting the machine do all the work.

i would like to run some parts for my airsoft guns, rail systems and metal body's and whatnot. the stock stuff is cheap potmetal and i want to make better ones out of 6061 aluminum. which means i am in the market for a good benchtop cnc machine, with a fairly large work area (20" x 10" x ?" is what i'd prefer to have), and able to keep tight tolerances. should i be looking for a built machine or be looking to build my own?

any info and/or opinions on the matter is greatly appreciated.

Mike