Hi all; i am planning on running a 10' x 20' (4 pc - 5' x 10' alupanel 3mm) billboard for a friend on my fb 500 UV flatbed. Since this is a friend we are using him as a bit of a guinea pig /trial and error situation. He currently has the signs posts and backing plywood in place. I was planning on printing them on my uv flatbed without lamination, 4 pieces - 5' x 10' sheets on 3mm alupanel, mounted to the plywood with metal roofing screws (??). I choose metal roofing screws as the are very durable and come in many different colours so that they are not as visible in the print. I use my fb500 for wholesale signage (mostly coroplast lawn / real estate signs) so installation is relatively new to me and alupanel is also only slightly familiar to me as well. I am not very familiar with other substrates, dibond, Crezon, etc. I appreciate any comments on above materials, mounting etc. Thanks!