We rescued a 1982 15 over a year ago and are in a working project. We use it for weekend to month or more trips as we restore andmodify it.
Pictures of it outside and in will help this group assess what may need to be done first. The Scamp folks have gelpful service, and many items have good alternatives or subsitutes available locally or on the internet.
Barring major issues, do not mess with the ensolite / elephant skin. It is a beast to clean off of the fiberglass and does have some sound and temperature insulation. Gently clean with soapy cloth and rinse then wipe dry. Use a flexible (lates or ?) paint if you want to change color. Make the surface is treated before painting
Are the roof supports if place or were they removed in 'modifications?'
Watch the Scamp manufacturing video and check it when doing major work. How it is made helps you understand what you are working with.
TIRES! They may look good, but likely are ready to die. Check the tire date code ( How old are my tires? - CheckTire.com
) If they are over two or three years old, be wary of long trips.