Dearest friends, please meet the Walker Titan XL 45.
I measured my camera. I need a 4" x 4" board. The camera is 8 cm from board to ground glass fully collapsed. Looks like I need a recessed one. SK Grimes does not appear to have graphic recessed boards...at least online they don't. I'm assuming copal 0 is 34.7mm (35mm?).