What do you think of this setup??

I am going to be getting all of the shit top bag my frontier prolly next week. this is what i have put together, tell me what you think. If i missed something or should change it let me know.4 1/2 valves (fills)4 3/8 valves (dumps)Going w/ SMC2 5 gallon tanks2 viair 450's2 2500 conitech bags for front2 conitech 2600's for the backwater trap, pressure switch and switchbox.What size air line should i go w/??