Thanks.... Barry, the sunken silver bath will take a Lund photographic whole plate or 8x10 'traveling' bath as they are the same dimensions front to back, just wider for 8x10. Right now, all I have is the whole plate version. I hope to get the 8x10 one in future.
I was also thinking about making another sunken bath attachment that would allow you to put cool packs in it to keep the temperatures down in hot weather.
I'm also struggling with what color to make the box... white on the outside, black on the inside, or just plain varnish inside and out... Not sure.