I am having trouble finding a lens board for the GVII.
A flat board is easy - it's the same as the ones for the Anniversary Graphics - a piece of wood and a table saw or router is really all you need. As for the recessed boards, I have an extra one of those if you're interested.
I've had a Calumet 400 wide angle model and still have a GVII. I gave the Calumet to a friend---not because I didn't lik it (I did) but because I wanted my friend to have a good 4x5 camera. I eventually missed it and replaced it with the GVII.
They are both fine cameras and capable of everything more modern (read expen$ive) cameras can give you.
My advice: Keep the one you enjoy using the most.
I kind of get a kick out of my GVII all tricked out on a Tiltall tripod---aluminium overcast!