Well, I head back from my friend. He said that he really couldn't talk much about the shielding on the Bigelow modules, but there are some articles on space.com that talks about them. Sorry Wrangler.
No worries, as long they have them is what i only care about it. Corp secrets is to be and should be expected! :)
Cosmic Radiation is one those things that really big road block in doing things in space with people. I heard somewhere (i don't recall so don't sue me.) that one possible thing is to put human waste in the linings of the wall, since some property of makes it harder for cosmic rads getting through.
I for one, would want extra shielding from the shielding. Especially a plumbing problem accrues.