Well first let me congratulate you on a great car to restore and also give my sympathy. As a 69-70 owner we do not have the huge aftermarket that some of the 65-68 owners enjoy.
Second is where are you located? The reason is there are several good parts suppliers that offer good repro parts (National Parts Depot, Virginia Mustang, etc..)
Swap meets and ebay are options to getting the parts that are not reproduced. Do your homework on these because you don't always get a good deal. There is also a 69-70 website that has some good classifieds.
Personally I would look for some good used doors, and make sure you keep the glass and brackets, these are going for at least $200 a side.
