How about giving it a nice name, and stop calling it a Wreck!

Really, how encouraging can it be, to be working on a "wreck"?

What is it in your dreams? (and don't say, NIGHTMARE! lol). Get the kids involved in finding a new name that's a "possibility" name -- that reflects how great it'll be when it's all fixed up and you can all go camping together!

Any small jobs they can do to "help" on the work so it becomes a family project?
Wishing you and and your family well and hope you have lots of fun together.