Be careful how much you hoak around, I did the same and spent a few months repairing holes, replacing both outriggers ect. A friend suggested lifting the body off to check around rear section where a frame attaches , turned out to be rotten right through and what was left was paper thin. I recommend you try and check the bits you cant see with a mirror and torch before you have pumped a lot of cash into repairs.yup - once the 'moisture seal' had been removed (*underseal).
He is 20 years old mind, and never had its arse replaced