Laser Engraver Bed and Laser Holder

The small laser engraver I have was sold with a laser holder and a small acrylic bed made of a simple sheet. The user has to user hot melting glue to fix these to the CD/DVD mechanism.
It works, but it's not a neat solution. So I designed replacement in OpenSCAD:
- A one piece bed
- A support for a basic aluminium laser holder
- A printable version of the laser holder

The bed and laser holder support are designed to be inserted over the original CD/DVD mechanism. In the model I have, ther