rdtsc: I don't like the idea of unsupported round rails like the SFC16. I want to basically use as much of the original machine. I like the belt drive mechanism, and I want to reuse it by but with longer belt. I want to be able to fit 36" X 48" plate in the machine. So I need to add abit more to that for the rail. Do you know what are the closest dimensions of an 80/20 extrusions to the extrusions in the old X Carve That I have? And then to add 2 small "H" profile like the MGN linear rails.