Neat approach to case fabrication, I like it
Do you plan to manufacture and sell those?
By the way that's a nice example how much bigger Sentry would be if it was frame-based
Few other questions that come to my mind:
1) Are those vents laser-cut?
2) Are the panel edges fully extruded or did you need to CNC the sides to fit in those corner profiles?
3) Are those holes for countersunk screw holes chamfered automatically by a machine?
Few notes I have on such design if you plan to make it a commercial product:
1) Use of panels without bending and the way it's assembled means the shipping package could be smaller, but the buyer would need to assemble it from scratch. That means cheaper shipping, but a requirement of quite complex manual or some kind of tutorial. It also means packaging of each piece separately somehow for protection in transport.
2) While the case may be slightly lighter than Sentry, I believe it lacks rigid mounting for pci-e riser, so I wouldn't carry such case in a backpack with a full length open-air GPU inside. That could end up badly for the card. Mobility might not be your target though.
3) There's a lot that can be done with your vertical stand to make it look better since it's a 3d-printed piece. That can be a differentiating factor for the looks in vertical position.
4) Connecting cables to the motherboard might be a little pain since the frame is all around.
5) Power connector location is really risky - this is literally the hottest spot in Sentry. Routing the cable at the back of the GPU is additional risk. You are risking isolation melting, smelling "burnt cables" and in extreme situations plastic dripping into the GPU. You might assume that it'll be okay, but people will put 1080TI and Vega 64 inside
