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Thoughts

cheap
cutting area 12x12x6
equal length parts for lead screws, and linear shafts
few custom parts as possible
few wood cuts as possible or in small enough sections machine can cut itself, Keep wood parts to a 2x4 sheet of half inch birch.
single PCB for control 4x6 inch in size
find good power supply for everything
tweak 5d reprap firmware to control spindle and allow for tool changes
cuts for endstops and encoders
possibly go to higher thread per inch lead screws
work on X,Y,Z flexing. Look at 1/2" guide rod for increased rigidity.
write gcode for zeroing out cut area
larger Z platform for holding different tools, spindle, extruder, laser, router, dremel etc
figure out good way to mount bushings and leadscrew nuts.

Design Notes