I'm trying to stay away from as much precision machining as possible in my mill build since I don't have access to a machine shop (anyone in the Dayton Ohio area help with that?). I was wondering if 1.5" square bar cold rolled steel would be accurate enough to bolt 15mm linear rails to. This bar would also be bolted to a length of .75" thick pre-ground steel plate, the geometry is shown below in this concept CAD model (still working out the overall structure).