I will start off this reply by saying outright that I am in no way an expert and what I do is completely self taught. So here is how I do my sub box. Since I have no experience with wood finishes ,other than a little veneer with urethane I choose to use an automotive finish. Most of what I do involves a lot of sanding ,the smoother the surface the fewer imperfections in the paint. The paint is called Nason which is a DuPont budget line. I use 2 or 3 coats of 2k primer filler then 2or 3 coats of base color followed by 4 or 5 medium coats of Clear. On these boxes I sprayed all the clear coats without any sanding in between, On future projects I will probably sand in between every second coat or spray one side of the box at a time so the clears levels itself better. I waited 24 hours for the clear to harden then sanded it with 2000 wet or dry sandpaper using the wet option . Its called color sanding for some reason. Anything much coarser than 1000 will leave sanding marks in the clear and they are a real biotch to buff out. So I just sand and spray and wipe and inspect for hours and hours until I am satisfied its as smooth as I can get it. I use maguires #2 buffing compound with a foam pad on my big heavy buffer to get the initial shine then I switch to a wool pad to get the final shine. I use less and less pressure on the buffer pad as the shine starts to come out. I clean the pads a lot during the process and i keep the pads moist while buffing. After it is really shiny i use maguires swirl remover with the buffer then follow up with Mothers spray on wax. I do all my polishing under fluorescent lights which makes every imperfection stand out. I work at it untill i cant get it to look any better. When it is inside with normal lighting it looks fantastic.(to me )
The round over is 3/4 inch. I just took a guess and chose that and i think it looks good.