re: Removability; what about something a simple as painters tape over the steel frame, then construction adhesive, then the luan and screws? When separating, the painters tape will be the weak link, but *should* still bond with the adhesive enough to prevent the luan from getting wavy.
Update: Ordered the steel today. I got the 1" 16 ga. 20 sticks of 24'
SV, I have a ton of coffin/casket locks. They would be darn sweet. I could even drill the steel so I could allen wrench from the back.
I think I would want to cut the steel framing to inset the locks and weld them in to regain the rigidity.... at least for rigging/flying. If the coffin lock is on the back, then the attachment would allow for flexing forward. I would want the tension point in the middle of the tube to prevent that.
I also considered draw hasps, or a clamping system for floor-mount options. These would pair well with your jigged pin idea.
Update. They're built. I'm currently in the process of drilling 240 holes with a jig so I can easily bolt them together. No lauan on them yet, but it isn't immediately needed for this show.
Turned an old 4x8 work surface into a jig with a little tweaking.
I can actually lay down a fair bead when I get the settings right
Susan the wonder volunteer prepping the steel for welding
120 holes yet to drill and I'll be done.
All of them measured corner to corner within 1/32" of square.