I had a pair of rusty R/T doors,that I cut the gilled sections out of,and grafted them into a nice pair of regular doors. I cut the doors an inch above the lower body line. I cut the upper section one inch below the body line. I cut it top to bottom about three inches after the stamped gilled section. Then I ground the tack welds where the forward section of the door skin wrapped around the inner structure. I cut the non R/T doors the same way,and welded the gilled sections in,and blended them in,and tacked the forward edge on the inside like the factory did. It wasn't hard to do,but the welding took time because I didn't want to warp them. R/T doors are expensive and hard to find,I have 11 of them,six are on my cars. Fiberglass ones would be a lot of work to make,and the market is limited. They would only fit 71/72 Chargers,as 73/74 Charger doors have different body lines. You may be better off to make a doorskin that could be bonded onto the factory inner door structure with panel bond and counter sunk rivets. If someone were to make stamped sheetmetal gilled sections that could be grafted in for 71 R/T and 72 rallye Chargers,that would be cool. My friend has been trying to get AMD to make R/T doors,but they say there is not enough market for them. My friend is personally resopnsible for all the 71/72 Charger pieces AMD offers,he let them use all his NOS and nice used parts for templating,and he test fitted every piece they make. He did the 71/72 Plymouth B body pieces too. He recently got AMD to do the bulge hoods and the Ramcharger hoods,they wouldn't do the R/T hood because it is a one year only hood.