I understand how bubble-hash is made, but you may very well be right, I have never had a hemp plant to try it out with. But in regards to THC being disctributed differently in hemp than in cannabis, I am sorry but I have to disagree. In no case that I've ever heard of is THC spread throughout a plant, wether hemp or cannabis, ruderalis or reefer. The THC is contained in resin glands, which are much more numerous on females than males, wether you are talking hemp or not. They are located on female flowers and the leaves surrounding them (most dense on calyxes), and on the leaves surrounding some male flowers in a lower concentration. I would think even on a lowly hemp or ruderalis, these glands would still be in the same place, they just dont produce enough resin to create the trichomes that we are all used to seeing. That doesn't mean they aren't there. Thats where the 1% comes from, right?
It is scientific fact that THC does not flow through the cannabis plant like tree-sap flows through a maple tree. Since this is the case, It seems the most likely place for the small amount of resin available from hemp would still be in resin glands, just like they are in marijuana. They just don't make alot, so it doesn't make that little ball on a stick that we see on marijuana. The gland is still there, just in lower number and concentration.
I figure that if you dried your flowers completely and were able to make a very fine dry powder, a very small amount of THC could be extracted with the bubble method, if you had enough screen bags, the tiny broken up peices would accumulate somewhere. That is why I included the step of powdering the dried leaves, because you couldn't get anything if you used regular bubble hash methods. This is a pointless argument though, who makes hash out of hemp? lol.