I'll probably get hated for saying it, but IMO you've got the basis of a really nice fixed/single speed there. The short rake track forks might be an advantage in that respect. You'd expect a much longer rake if the forks were original to the frame, but IMO they do not look 'bad' or even 'out of place'. As Roadking says, look for a serial number on the fork steerer tube which matches the one on the bracket-unlikely, but you never know. Stay sweet(ish) with the purists by leaving all the brazed on cable guides etc. where they are. Also, with so much paint gone, nobody's going to be grumbling about keeping it original, so you can refinish it (or not) as you choose. Probably way too late in this case, but cleaning up the tubes carefully by hand can sometimes reveal the 'ghosts' of the original transfers. The stem is 'Titan', BTW.
I would think that the treatment of the top of the seat lug is fairly unique, and somebody should recognise it's source... not me, unfortunately.