The greyish sign behind there, we put up about 20 years ago. Wooden 1" x 4" stringers about every 2 feet. 4' x 10' MDO panels screwed fast. The company changed their colors and appearance about 8 years ago and we just mounted this right over top. We put a 2" x 4" piece across the back of each panel and put 2 eye hooks in it. Lifted them up and one guy held it in place while the other guy screwed it fast with 2 more screws. Then, we released the 2" x 4" and lowered it for the next panel. The remaining holes were used over again, as the first screws were slightly smaller. We went across the entire top. Then, worked our way down and screwed them all in. A 2" x 6" runner was eventually put at the bottom about 3 or 4" up and that snugged them all up when we got to the bottom. Extra care was given to making sure al the panels were perfectly plumb, so we didn't hafta mess around later on. The whole sign is about 48 some feet long. Might've been an even 50' From one end to the other, either the original sign was off or our new one, but we were only aff by a little over 3/8" . We just did this back in July for a 15' x 30' and an 11' x 28' and again, you couldn't see any seams. However, this one was completely printed when we put it up, so any misalignments could not be seen, but it leveled off perfectly, once again. I'll look for those pictures. Not sure I'll post them as there is too much customer information on them.