After carving all the backgrounds, I went over the flat open areas with a flat chisel to eliminate any burrs that may catch ink. They are not anywhere near perfect but will just have to do as I am out of time before my trip to the printing lands.
Two of the background blocks had broken in a couple of places and I re-glued them together with wood-glue.
Finally, when all was tweaked enough, I lightly glued each large block to a background matt-board and then re-assembled the puzzle over the glue so that everyone sits still and behaves properly during printing. I used Lineco white glue spread with a foam roller for speed and evenness of application. Also this glue remains flexible so that if any blocks have to be propped up from underneath to aid in printing, the flexible glue and matt-board will yield.
Here are the next set of process pictures:
Now on to building the paper-placement jig!