Yeah, talk to a serious hunter, fisher, or gardener who vac-packs their own stuff for the freezer. (We have 3, because when the fish are in, they're in and we 35 salmon to deal with in a night).
To do on your own, if you're willing to experiment:
Put a metal rod or 1/8" bar in the oven at, Jeez, I don't know, 250F. Come back in 20 minutes. From the bottom up: wood base, ziplock to be heat sealed, wax paper, press with hot rod. I'd suggest gloves!
If it is too hot and melts it or too cold and doesn't seal, adjust the oven temp up or down.
Post your results.