I do almost the same thing. I don't use acetone though. I start sanding with 220. It takes a while. I use it till it is worn nearly smooth. acetone only on the checking. I tape like you, then sand with 400 grit wet or dry after matching the right and left hand panels to each other. I work my way up to 600 then 800. The finish I use is Formbys tung oil. The first application is rubbed into the wood like waxing a car. I let it stand for 24 hrs. Then I use 000 steel wool, wipe clean and smooth another coat on and let it stand for 24 hrs. I repeat this for 5 coats, letting the 4th coat set for 3 or 4 days. After the final coat is applied with a clean piece of T-shirt I don't touch it for at least a week. The Formbys I use is the high gloss. If I want a satin finish I simply take the gloss off with the steel wool. That tung oil is tough when applied in this manner. My .22 rifle was done this way with 8 coats about 15 years ago and still looks like the day it was finished.
great pictures sir. Great post as well!
Peace,
gordon

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better have that checked