I've had the same problem with residue from the Press N Seal. I managed to get it off but had to repaint the area. I highly recommend it to use on open containers of paint. After use, wipe the edge off, put a piece of PNS on it and screw the lid on. No more almost impossible to remove sticking lids.
Get yourself some stirring sticks. Panera Bread has nice ones. Get a roll of 2 sided tape with foam in the middle. Cut a strip of tape and stick it to the stirring stick. Put whatever grit of sandpaper you want on the tape. Trim the excess if you want. I like to leave a little so I can use the edge of the stick to sand tight places.
I use a plastic soft drink bottle. Put a piece of double sided tape on the cap and attach the body to it. I put some sand or gravel in the bottom of the bottle to aid in stability. I had a pic on the forum here but can't find it.
Great work! I've got one that's about 90% done with the exception of the floor pan and it's attached parts. It was warped and I managed to break it. I'll try again sometime to finish it and hope it comes out as nice as yours.
Great job! This model was the first one I finished when I returned to the hobby. It's an easy build and one that I recommend for beginners or as a confidence booster, if needed. At the time I finished mine, I needed a boost after a few failures.