Ross,
I'd like to make a suggestion or two on your first commercial work.
Either material, PVC or HDU are good choices. How are you going to finish the panel and what routing technique will be used? Are the letters raised or incised?
While the panel shape gets a C+, the layout on the copy needs some help. The way it is now Boaring! It looks as if you just set Times Roman and left it there, all the same size and weight. For the sake of others on the forum, lets see if there aren't other options.
Joe Crumley
www.normansignco.com