I want it to go to about half handwork and then the vital seams by machine, the same that you would expect from a top-level ready-made European dress shirt. The sleeveheads, cuffs, yokes - it will be apparent they are attached by hand when you look at them. Up close, like a European dress shirt, you will see the pickstitch around the scye and shoulder. Buttonholes will probably be darned by hand, buttons will be chickenfooted on. The sides will have proper gussets, and a nice single needle stitch in two parts (body and sleeve single-needled separately) - cuffs and collars will have full floating interface. We are talking the full meal deal. Add in Japanese selvedge oxford cloth and the thickest pure MOP dished buttons I've ever seen on any shirt.
There's a problem forming; the shirts are going to be at such a high level, where I will need to bring everything else up to the appropriate level if I want any kind of consistency. Looks like I have some work to do. This is how I want TOJ to be, going forward though. Similar to what you know, but I'm looking for that next level.
Sounds like a very interesting project. My shirtmaker doesn't offer hand sewing but I've always admired those Borrelli / Finamore / etc shirts with the altoid buttons. Have a look at MC and the London Lounge, there are some threads that might contain some useful info for ways to guide your shirtmaker