First you will need to remove the tail from the wild turkey, this is not too difficult as the quills are not attached to the main body like waterfowl. Cut around the base of the tail until it detaches, it is always better to have to much than not enough you can always cut off what you don't need later.
Now that you have that done you are going to need to remove ALL meat, fat, membrane, etc., if not you will have bugs. Take a knife scrape off all you can, cut between the quills (not to deep don't want them to detach). Once you have removed all you can with a knife pour borax on the quills and rub in everywhere, between the quills and on to the skin.
Take the piece of cardboard, about 2" up from the bottom drawl a line from right to left, now measure over half way (9") and drawl a line from top to bottom. Now spread the tail flat out along the bottom line( good side toward you) and center the center feather with your center line. Take a piece of masking tape and tape the center feather to the cardboard and also the right and left side feather on the 2 " line. Gently move feathers on each side so they look even, look at the feathers, one will lay on top of the other. Once you are satisfied take a piece of masking tape from the far right side where the feather meets the 2" line and run it up to the center feather, this will hold the feather in place, do the same on the other side. ( now you should have a upside down "V").
Shake off any excess borax. Mix up some Bondo and with a butter knife or similar instrument. Put the Bondo on the quills being careful not to get any on the feathers, if you do don't panic, let it set up to a rubbery state and it will peal off. Don't over do this step just knead a nice even thin coat to hold things in place. Once it has set up to a rubbery state take a knife and cut off any high or undesirable places. Wait till it gets hard 20 minutes or so flip it over and repeat the Bondo process. Peal the tape off gently once side two as set up.
All there is left is to install the wild turkey tail onto the plaque. If you have a beard cut it off. Get all the meat off it and rub borax on it. Than fill a small dixie cup up with borax and insert the meat end of the beard into it overnight. Take it out the next day shake off any excess borax and install on the plaque.
