cant recall right now but there is a place in Bellingham that builds them we had a 120 gallon one built 5yrs ago for around 500 bucks out of Alum, there are only a few places that build them and then can "Coast Guard" certify them, dont do a homemade one, if ya blow up the Ins Co. wont cover ya or the people on board, call a few boat places they will know who they are up there.

Bud.
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''Should have been here yesterday, It was like the old days"