Great find. Start from the bottom up. Check out and the repair frame and axle
. If in a shop first remove front and rear window. Pull out seats and lower kitchen cabinet and carpet. (Leave closet in place for now for support.) Strip out plastic covered foam under the seats. (Not ensolite.) Try to save ensolite on walls if possible. Inspect and replace floor sections if needed. (Replace one floor section at a time in a Scamp). Paint
the frame when floor sections are removed. Check table board in rear wall for rot an R&R if required. Remove and reseal the other windows
and vents. If you need to paint
the interior & exterior do it when all the windows and vents are out. Reinstall side windows and vents. Run electrical
and new gas lines as needed. After wiring and gas lines are done glue refletix under the seat areas. Now start making sawdust. BTW nothing in a Scamp is square or straight. If working in a shop the last thing to do before you roll it out is to install the front and rear windows. Plan on adding at least $1800. to the orig, investment and you should have a great little trailer.