Welcome to FGRV Ownership
SCAMP rivets also have a cap and a retainer on the outside. Some times you can just replace the caps, other times you will need to replace the retainer and the cap, in which case it will require removing the old rivet. Drilling out and replacing Pop-Rivets is fairly easy and
SCAMP will sell you the right size rivets, caps and retainers. I always put a dab of RV putty tape under new rivets to help with the seal. But, unless they are leaking, they usually don't require replacement.
I'll almost bet that the painted over
windows were badly fogged and needed replacement anyway. As many are plastic of some sort, there isn't much that will remove paint without damaging the plastic in the process. If they are glass I'd still remove them before stripping to prevent splash damage to the bodywork/interior.
If you only camp where there is power, a small 120 VAC heater (or when
boondocking a small
propane heater, but be sure to keep a window open for air) will usually take care of down to about 35 degrees. Much below that and you will wish you had the
furnace. Not only that, the
furnace will quickly take the chill off in the morning. We have all three in our 13' Hunter, Furnace, electric heater and a Coleman BlackCat LP heater and use what's best for the moment.
Can't comment on
painting as our SCAMP had Rat fur inside.
Good Luck