Car finally off to body shop!

I need to set up a my garage here...in my spare time...

Yesterday was the day. My Scamp was transported to the body shop. Any suggestions/advice from others who've done this before me are appreciated. My body guy seems to care, I'm meeting him again tomorrow to go over all my concerns, what I've noticed that the car needs etc, point by point.

One large issue for me is what to do about the underside of the car. This is going to be a three season driver, taken to shows/cruises/dragways all for fun. This shop is not big enough for a rotisserie job, and I do have a budget to keep in mind, but I do want the car to last as my sons will inherit the car when I'm gone. I'm thinking just address any localized rust issues, remove only loose areas of undercoating, paint those areas as needed then just have undercoating resprayed. Of course I'd like to have a full redo on the underside like the topside (it's getting new rear quarters w/wheel housings and trunk extensions, along with front driver fender inner and outer then a complete paint job done including engine bay, interior, trunk) but it's not going to happen that thoroughly. I don't need the additional stress of worrying every stone that hits the underside is going to damage it. Just piece of mind that things are done right and will last for a car that will never see winter again (it already hasn't in the last 26 years).

Thoughts?

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Is the body shop going to work on it when they aren't busy or is it a dedicated rehab? I have found that shops tend to take in fast money and put your project on the back burner several times. Long restorations (over winter months) take up shop space I was very fortunate to have found a retired body man who did my sheetmetal work in his own garage. I was very lucky to have found him and he turned mine around in six months. Basically doing the same work as you are having done. Hope you have the same luck. Tinmannz is correct about the rust, it hides everywhere.