Mounted Yes, unmounted, well if they are unmounted, I might as well make them myself.
All a deluxe board is, is a board (not even a full length image in comparison to the standard ones too), that has larger hexes.
No manner of new "art" is going to be that thrilling. Any one of us here can scan a board, and then piece together a board cutting apart the image of the scan, to re assemble a new image, if all the plan is, is to end up with a new image that just happens to be on a large format map.
Mounted would at least be interesting. Not sure what terrain would be worthy of the effort though.
I didn't regret buying the first two sets. Didn't think I was being milked for cash. They ARE fun to play on. I have often thought of just colour copying my standard boards, to scale up to match the deluxe size myself. It's not like that is an original idea though.