CNC Frame Design Help

[routercnc]

I'll echo Jazz's comments. Plus it looks like there is no gantry as such, just a pair of rails which support the spindle?

This might be OK on a plotter or laser cutter but if you want to cut aluminium this won't be anywhere near stiff enough.

Combined with the unsupported rails on the sides of the bed and you will do more rubbing and vibrating rather than cutting aluminium.