--If it's going to get bumped or dragged along the bottom
you'll want something tougher than PVC pipe. Under pressure with a
pointy side load it might collapse. Also there's the matter of the end
caps. They'll need to be thick and at least one will have to be
removable. The traditional method is to have it screwed onto a housing
that has sufficient surface area on the sealing edge to accomodate an
O-ring in a groove and a dozen threaded fasteners. Best way to do this
would be to lay up your own housing using fiberglas.
I've got a buddy who used to make camera housings and that's
the way he did it. IIRC he used threadserts in predrilled holes to hold
the faceplate bolts. A light bar could be attached in a similar way
with threadserts in other parts of the housing. The O-ring groove was
molded in as a half-round groove by using half-round dowel glued around
the base of a male plug mold.
One great advantage of a fiberglas housing is that you can make
it conform tightly to a specific camera shape, so that ballasting is
not as big an issue.


--
"Steamboat Ed" Haas : When does Inuyasha get
Hacking the Trailing Edge! : to bone Kagome??
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---