This seems like a ridiculous amount of work for a kit that expensive.
So, thanks to a fellow Amigan's kind mouse
donation, I made a new model. One to fit a regular ball mouse
(in case you *somehow* lost the trap door), and one that hopefully fits the laser upgrade kit.
disclaimer: I only noticed after uploading that there is a particular groove on the laser kit, I'll be happy to adapt my model if someone were to send me precise enough measurements
Free to Download 3D Print Files