Being a cabinet maker, I'd say you did a great job. I use dye stains all the time but your method of applying is a little different then mine for a sunburst, I think you just taught an old dog a new trick. I usually spray the dye, let it dry then rub it out a little. I usually have the problem of dry lines between the coats (if I use a rag where the dye stain dries), leaving a slight line. You have a good touch. Very nice finish.
I usually thin the lacquer a little more for the first few coats with lacquer thinner or a slow drying solution. I use a per-catalyzed lacquer, not as hard as a catalyzed (where you add hardener and use in 24 hours). There is a brand made by "M.L. Campbell", called "Magnalac", it's a pre-catalyed lacquer, just thin it and use right out of the can (it's actually pretty thick so you thin it a little more than usual). Comes in various glosses. the more gloss the harder the finish. Takes around 30 days to fully cure but in 24 hours it's 80% as hard as it gets so put the guitar together a few days after spraying.
Adding a slow drying agent gives a better finish, no fish eyes, no dimples, levels nice and dries a little slower giving the lacquer a chance to even out.
As far as the neck width, I'm with Ed, use the 1 5/8" width but cut a new nut cheating a bit on the width, this gives me the room to get my bigger fingers down the neck, I never had a problem with the strings falling off the board either as long as I didn't get too extreme.
You probably already did all this, so for a guy who is used to 1 11/16, how was the new nut on the 1 5/8?
al