Thanks! They aren’t affixed at all. They’re just resting on bars that are sticking out perpendicular to the stand. Interestingly enough the Intellijel 4u cases do have grooves that are compatible with the MakerBeam standard, but these cases have been discontinued.
There are angled brackets with the 10x10mm Makerbeam standard, but I’m not sure I would trust them to hold up the weight of a loaded 6u case. They do provide specs if you have the knowledge to do the calculations of how much weight they can bear depending on the load, but unfortunately I don’t have that knowledge.
The way I have my stand set up the whole thing is slightly tilted back because of the front legs. If you had a similar set up you could tilt the whole thing back more with longer front legs. I’m not sure how it would work if you wanted a different tilt between the two cases.
There is almost no clearance between the handle on the top case and the top shelf of the desk so the top case is really stable for that reason. I couldn’t pull the top case forward even if I wanted to. I have to slide the whole stand forward in order to remove the top case.
If I didn’t have the shelf above the top case preventing the case from falling forward I would have built the stand to extend much further in the front at the base to prevent the stand and cases from tipping forward and secured the top case with a bungee cord or furniture strap on the handle attached to the back of the stand to prevent the case from tipping forward.