I'm looking for a fast beachcat to tool around with during the summer (ie it doesen't have to be competitive within its class association) and I stumbled across a mid-1970s fiberglass tornado from a canadian manufacturer that I do not know the name of.

I'm wondering if anyone here knows anything about who was building glass tornados during the 1970's, and how well their boats held up. The owner is asking a very reasonable price for the boat, and when I go to check it out this weekend does anyone know anything specific to look for. I'm not afraid of older boats, but I'm just curious about the build quality of the early fiberglass tornados, and whether this canadian-built boat would be up for non-competitive sailing for fun. Also, would it be unreasonable to upgrade the boat to someone else's race-worn but otherwise useable 2000+ rig?