I generally cut the pieces and do various operations such as pocket holes, dominos and such and then finish before assembly. Even if not finishing before assembly I always sand the parts before assembly. It is much easier to sand and finish or paint pieces that are flat on a bench with no corners to get in to. For cabinet boxes I usually am using prefinished plywood. The variety of things I build does alter the order of cutting, assembly, finish work dependent on the piece.
I use prefinished 3/4" birch plywood when I can. I was just wondering if prefinishing was the way the to go. Will have to try it out on my next project
I cut and assemble, once I know everything fits I spray everything as a flat "panel" and then do glue up. If necessary I'll tape off so I get wood to wood contact for yellow glue. You could use liquid epoxy otherwise.
I wish I had pre finished at least the inside. And taped the glue edges. Luckily this is not a significant project. It is one that I can learn from the error of my ways! [smile]