I got inspired by intruder_bass' work and with his help made one, too.
Here are some pics:
After I completed my work I was told that it is more frequent to have helos with sound proofing on than off, even in the SOF-business.
To answer your question: no, there are no aftermarket products available ... yet.
Last week end I tried to make a resin copy which turned out a mess I'll try to post some pics of the disaster shortly. Fortunately the original only needs some minor touch ups.
Guess I'll have to figure another way to make the mold.