Also (my opinion) I don't think the Jacobs are at the point where one can't be found complete with the drum for about 1000.00. So why buy JUST a drum for that amount when with a bit of searching, one can be found complete for the same price.
Maybe down the road, when finding one for sale is rare, yet there are all these shells with no drums, then there might be takers, but still, tool & die is an expensive trade, and I don't think it's cost effective to make dies etc for such a small demand of a product.
UNLESS china can make one for cheap lol.