I'm also interested in adding baffles to quiet the gun. I bought my moderator from Silent Thunder Ordance. Since I had an order in, I bought 3 of their inexpensive foam baffles.
They said only 1 baffle was needed but believing "more is better" I added all 3. I haven't tested to see the difference with and without, but with their moderator & baffles my gun is sufficently quiet for backyard shooting in the neighborhood.
After shooting 30-40 Pellets, the foam baffles got compressed at the base of the barrel. Don't know if that's good or bad.
Have you tried adding the Daystate baffles? On this forum, there doesn't seem to be agreement if they work.
I'm interested in your project. If you go into production - let me know.
Bill R in Ft Lauderdale