If you have a 3d printer, or know someone with one, you might look at the PrintNC project. Completely open source, uses steel rectangle tube and some 3d printed parts (non structural). Look it up on youtube. it's a very easy to build machine and capable of cutting aluminum, so any wood you could toss at it would be fine. Get a copy of v-carve pro (or use F360) and you off and running.
