Might help to know what wheels it takes (700 or 27 1/4). Do you have the original wheels or any others you can put in to check?
If you're running it single speed or fixed you'll be a bit limited by that drive side dropout. Raleigh did this on some models. They half fill in the dropout so you have much less fore aft movement (but leave the other side so you can line the wheel up), can make chain tension harder to achieve. May involve half links or changing the gearing. I guess you could file it out but it'd take ages and easy to mess up.
It looks like you're going for a classic build. IMO it'd look much better with drops or if you're going with flat bars something a bit more period than those flat bars would look better (or just cover up the rounded ends). Just imo though, its your bike.
Will you be getting new decals for it?
Good luck. Looks nice so far.
Any idea what model it is? What age?