CNC Router - Base Fix

I ran into a design problem after getting the carriages done.  I assembled the two carriages to the gantry tube and placed the assembly on the base.  Something didn't look right.  I took a measurement from the base to the gantry tube and only had 4.5" on clearance.  My cad model showed 6.5".  After digging into it, I figured out that my cad model for the sides was incorrect.  To fix it, I glued two pieces of 3/4" birch veneer plywood together and cut them out to the proper dimensions.  I then sandwiched the plywood between the aluminum sides and the base.  I added some lag bolts that go through the aluminum sides and into the plywood.

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