If he wants it to look right the first time and eliminate the hassle and worry of which plastic to use where, I would highly suggest he contact AP and purchase extra plastic. When re-building my ATA I picked up 2 sheets of 16" x 24" from Terrell for less than $35 (including ship). It was enought to rebuild my entire armor inside and out, cover strips, snap mounts, etc, I even have 1/2 sheet left over, well worth the investment. I'm pretty certain extra AP would be very close in cost. Just my 2 cents