Looks really good man! I would say keep a few fittings and some extra line in the truck, I only know one guy who carries an extra bag, but its certainly not a bad idea to do.
I don't know how deep into air suspension you are, but if you have any friends that are into it I would ask someone else (who knows what to look for) to get under it and look at the work done to the frame. Since we can't see the suspension I have no idea of the quality of work done.
I just would hate to see you buy someone else's headache and be stuck with something thats going to fall apart as soon as you drive away. I'm not knocking the truck, cause it looks clean, I would give this advice to anyone buying someone elses work.
Where in NY is the truck? I'm just surprised I haven't seen it at any shows. I know not everyone who bodies a truck does it for shows, but most people who put that much time and effort into a truck want to show it off, and I go to A LOT of shows.