I think the testing idea is a good one. I will go with that. As for building in a quick release that is not possible without over complicating the design. The design is really simple but very affective for what I want to achieve. The quick release method I have in mind for anything that might go wrong from full fire which I want to AVOID at all cost to something as simple as a muscle cramp gone wrong is to have a good pair of sissors on hand and quickly cut the rope. But doing that will require about 20cuts if my slave is in full bondage with this. Workable for something like a muscle cramp, unacceptable for a rapidly expanding fire.

I will test with wax like 1/2 inch away and I will test with short duration flame contact to see what happens. I will also look at canvas materials. I also intend to go with the safer foam that lists itself as being fire resistant.

Thanks.