Thanks for your feedback. I will take another look at this next year. I guess making the vga connector part more spacious has advantages so a heigher case makes sense.
I am a little unsure how many people will actually be able to use the case (being for XS sdram only). Therefore I like the universal case approach better at the moment.
Also personally I like the front/back panel approach in general, as one can modify the panels even without great 3D design knowledge. Then one does not have to print the hole case if one wants to test something new.
Also please consider that I am by know means a design expert. Anybody is more than welcome to come in with better ideas and solutions.