dickyknee
Almost Legendary
I might try that and see how that works. I may just get some of that stuff that they make eskies out of, which is sold in big thick sheets, around an inch thick and come in various dimensions. I will have to build some sort of box out of the panels which may be tricky getting the cords into and out of, but shouldn't be a real challenge.
Get some coreflute , it is very cheap , easy to cut etc and holds heat well , it comes in various thicknesses too, try Mr Ply and Wood type stores .