Regarding the magnets & such…
You mentioned attaching the MB via magnets at one point, this still a thing…?
I can see this being SUPER easy to 'upgrade' in regards to the M.2 SSDs if the MB was attached by magnets; simply pop the top (magnets), pop up the MB (magnets) & insert new M.2…!
Top panel is mounted with magnets. M/B - with screws.