Template for bodywork?

My 1/4's are shot around the wheel well. Can't find any replacements so have to try fab some up. Not looking for perfection just so they look like they belong to a Montego. So do people make a template so they get close? If so out of what?

You can make up a template with cardboard before cutting.

Check out Regul8r's ol' brown's resurrection thread. Your car should be simpler, without the character lines in the quarters. Ttry to find junkyard front fenders for a 77-79 thunderbird/ranchero/cougar/LTDII. Front wheel opening is longer front to back, but the overall shape is right. Section panels as needed to make patches, and don't cut your car until you are happy with your patches.
We used to use these fenders (or AMC hornet/Gremlin), to make flared quarters for other cars, the way Eliteman is doing to Regul8r's car

While I realize Regul8r's torino is NOT stock and may not be to everyone's taste, I was using it as an example of the process.
The Montego rear quarter opening already has a large flare to it, like the front fenders. Sections of the flare are already going to have the compound curves worked in as well as a lip on the edge, and it would be the same gauge as the existing car. The flexible edge works well if there is enough of the existing lip to form it to. Also, all the little gaps between the "fingers" of the flex edge will need to be filled in, which makes for a LOT of welding and more opportunity for warpage. I suggested the 77-79 fenders because it is still more or less the same as the montego/elite fender, but more common in junkyards by me.