If you can't fit the whole side on your print bed, you can print sides A & B and attach them using one of the double sided dovetails.

NOTE: Use support enforcers on the overhang IF you print in the 'right side up' orientation like I did. You could also probably print it on its side which might work better and be less wasteful.

Each side connects to each other using the dovetails and holds a backing in using the pegs.

I used double ply chipboard for the backing of mine, but there are unlimited options that you could come up with.