Hi, Ian, I'm late to the party, but here's my mustard, as the Germans say.
For stripping paint, I'm using Super Clean de-greaser now, used to be made by Castrol, but I think someone else makes it. There is also Super Green, which is supposed to be environmentally friend, which works as well. I use a plastic container or a glass jar large enough for the piece, and pour enough SC into the container to cover the piece. It removes paint in minutes (it stripped the chrome off the chromed fret in the Red Baron hot rod kit in 2 minutes). It's relatively not so caustic, though the maker recommends gloves, and the best part is that you can re-use a batch of it over and over.
For fine seams such as those on your piece, I use Squadron white putty and acetone, applied in one of two ways:
Method #1: I will take a dab of putty and apply it to the seam. I use old knife blades as trowels, and I also have a dental tool used to apply resin putties to a tooth, which I use for this purpose. I use the blade to remove as much of the excess as possible, leaving it in the seam. Then I take a cotton swab, dip it in acetone, and wipe it across the seam to remove the remaining excess putty, leaving putty only in the seam. Once the putty has cured according to the label, I will sand the surface. Removing as much of the putty as possible when applying will reduce the amount of sanding.
Method #2: I take a dab of the putty and put it in a well in my palette. Any non-porous surface will do. I use an eye-dropper to add acetone, a drop at a time, till the blob of putty begins to dissolve. Then I use a toothpick to stir the mixture to a consistent thickness, and apply it to the seam with a paint brush. I call this my homemade Mr Surfacer, and I hit on this method after I tried Mr Surfacer and found that even the thickest grade was not thick enough for my tastes. My paste is probably similar to Mr Dissolved Putty, too, but I've never used it, so I can't say for sure.
Hope that helps!
Brad