Sorry but I think sam might be right. That MAY be a total rebuild of the top. And you haven't even seen inside the lower half. If time and materials were no problem, then I'd say repair it. You'd need a large work area and several different trades to complete the job. Welders, carpenters and electrician, etc. It can be done, and you'd certainly be proud of the results, And you could customize YOUR way.
Mom, I think it was a member name of campthewestcoast that has done, what I recall as close to a rebuild of the top half in the most recent of time. Perhaps he'll pop up soon and give his opine on this situation. I'm REALLY glad to hear you have the space and talent to tackle this. I truly dislike hearing the phrase "Parting out a Hi Lo", but sometimes it happens. Just a suggestion, take lots of pics during the dismantle phase, you'll need them.