Well I got some info straight from the horses mouth. I emailed "Featherfoot", aka John Finnell, maker of the late PV series.

He replied and said the PV1 is 7" in diameter and 26" long.
PV2 is 6" in diameter and 15" long.

After a little geometry; I got roughly the same numbers for the PV2.

I didn't realize how BIG the PV1 was.

Now the next step; Hooking it up and seeing exactly how LOUD it is. Keeping my fingers crossed.