Squashed frog replacement for repraps: parametric , printable

This is one more element that used a big "vitamin" (non printed part)in my reprap that i wanted to replace.
The squashed frog is the part that is underneath the Y axis platform, and to which the belt as well as the bushings/bearings rolling on the rails are attached.

The initial version was cut manually from plexiglass, but due to my lack of good quality tools/workspace, while it worked , it certainly would not have won prizes for quality !

So i decided to design a printable version, that