I did my own and saved some money. Some ideas to share:
I really did not like the stock tail. It's too, well, cumbersome. So I decided to make a simple one. Cardboard mock-up, then aluminium plate. Large holes to save some grams :)
Mock-up fitting to make sure it fits ... keep the stock plate light as I think it is a legal requirement. You will need some holes for the lights.
Paint and reflective tape for safety,
As it is mounted ... the stock signals can be fitted provided that you prepare the holes for the stalks and bolts.