Jenny welcome to the forums and congrats on getting your dream come true. I'm partial to 73's myself. My excella is basically the same as your sovereign
with a few extras.
Is the clearcoat really bad on yours? The reason I ask is that unless you are going to polish it the shell will oxidize much faster with the clearcoat removed.
The best stripper to use is removall 220 available from VTS (Vintage Trailer Supply). It is non toxic and does a fantastic job to remove the clearcoat. It won't harm your plastic lenses or window glass. It also does not kill the grass and is not harmful to pets etc. It is also much safer for you to use, no gloves or masks needed.
I did mine with it and two gallons is how much you need.
Napier RemovAll 220 - 1 Gallon
It is a little pricey but worth it in saving effort and the safety factor.
Good Luck and post some pics so we can see your dream.
BTW is yours a rear bath or center bath?