If you want a rebuild project, have maybe $8k to put into it, and skills at doing 'stuff', you will end up with a fantastic little boat. I'd guess 18 foot or so. I seem to remember from my days as a kid that everyone that had that or similar Glastron loved it.
The chaparral stickers are above the rub rail, which no boat company ever did, so my guess is owner was having fun and his old beater boat he was trying to make fancy.