Unfortunately I don't have the in-practice experience, but I think using swivel fitting and put it's axis close to the hinge's axis would avoid stress on the tube's material. The <PCI Express Card Electromechanical Specification> contains all the drawings You need (from page 67). On the other hand You also have the possibility to download an existing 3D model from The Sketchup Component Collection and measure the size You need. I guess they are cutouts on the motherboard tray for design purpose.
Thankyou, Hawaii! I've been looking for a PDF like that for a while but usually it's been behind a password. This will help me a great deal. And those curves are indeed cutouts for an upcoming motherboard tray. This is not the final version because the design is a bit boring.
I'm almost certain I've seen aluminum profiles like that before, so I did some quick and dirty google image searches... hehe, not _that_ kind of image search! ...("aluminium profile showcase" / "aluminium store fixtures") and I _almost_ found it... not quite, but similar: [edit] NOTE: I'm not sure if it's possible to order profiles from any of these sites below, but I thought they might give you some ideas on what to google on. Portable alu cases might also use similar profiles, so that might also be a valid search option. (?) [/edit] No.1 (click to go to web page) (There are a bunch of other sites in different parts of the world selling the same product line of showcases, so it's not only available in Canada.) No.2 (click to go to web page) No.3 (click to go to web page) I hope this helps a little. Nice and simple design on those profiles (2nd version) btw, I like it! My only gripe is the visible screw heads, but you could just call it a design feature and leave it as is. Another possibility would be to drill the holes in the profiles from the "inside" and not all the way through, this would stealth the screws. Will be keeping an eye on this thread to see what you/others come up with. I wish you the best of luck!!
