I don't think that SketchUp model is very correct, you better check it against Gert's mechanical measurements of the beta board.
I don't think you can place the top part correctly, because the hole of the rca connector..
The front and back plate are they printed seperately ?
Beware of the limitations of 3d printing, like unsupported structures, unless you can also print support material...
But it is a nice design...
If you put your design on Thingiverse, other people can try it out or help with improving it.