Another possible alternative to cradling a panel would be to mount it on an ordinary stretcher but using the flat side and not the bevelled side so as to make the contact with the panel complete. Over here they sell stretchers that are not bevelled at all for this purpose. The stretchers can have the cross-bar for added support. I mount the panel to the stretcher using all purpose white glue and either clamps or heavy books to let the glue set overnight. The result is a panel well supported and well adhered to the stretcher, plus the whole thing is still relatively lightwieght since the stretcher doesn't weigh much. I also paint the edges and back of the stretcher black to neaten out everything.
Hope this helps.
Carlos
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