I decided that I should make some lasercut templates to make shure that the frontplate measurements are correct. Using the project feature in fusion 360 I had some sketches that I lasercut out. Using the lasercutter is ideal for prototyping because it is so much faster to use than the cnc.
The material is 3mm plywood and is more than enough to check that the dimensions are correct.
It fits the aluminum case! I will bring my speaker elements to the makerspace tomorrow to check if they fit. Progress has been made!