If you are reading this and on the fence about become a patron, just do it. It is well worth it.
I wanted to share my experience creating your maps using this post from your site as my basis.. http://2minutetabletop.com/index.php/2015/12/08/davids-map-printing-method/
I am very grateful that he shared his experience so that I could duplicate it the best I could. in my own way.
I used the backing board he recommended, spray adhesive, and black permanent markers for the edges. I did not, change the image in anyway from the pdfs you provide. I "did not" change the borders to be black, etc... I don't think I have the editing program he used, so that was not really an option for me.
I simply set my printer to "best quality", card stock, no border and used 8.5x11 card stock to print on. After attaching the maps to the backing boards, when cutting off the extra backing board, because they were 12"x12", I simply also cut off the white borders on the top and bottoms of the maps.
Then as a final touch, I put a drip of elmer's white glue on my finger and used it to seal the edges of all the maps. It dries clear and will help keep the map edges from ever lifting up.
But for $10.00, you could buy enough supplies to create (6) 4 Piece maps that are really sturdy. Plus you can stack them up into a super small stack and not damage them at all.
I may do a test of spraying either a matte clear lacquer or fixative to the map on a test piece and see if that will work well. If it does I will update the post.
Hopefully this is helpful to someone else...
Thanks again for the awesome maps! I have more to make...