Hi Elmo,
I'm lucky enough to have both the original half plate back and the 5x4 back, but no lens board. I have a whole load of mahogany in the garage salvaged from a large chest. Just a matter of finding the time to get the router table out and make some.
Would dearly love some bookform plate holders though, so I can try out some of the glass plates now available, ISO 2 wow.