Re:
Just my 2p.
That frame looks in pretty rough condition.
The area where the down tube shifter clamp has been looks rusty, I'd be taking the paint off and checking whether it's merely superficial.
Does the bottom bracket run smooth? If so great - the headset likewise? Is there a seatpost clamp bolt too?
If so, AND if the frame is exactly your size, AND if you have all the parts on hand, I would maybe build that frame up as a superfast flat bar roadbike, geared or SS. They call them 'stadtflitzers' here in Germany.
I wouldn't put money into powder coating that frame and fork. The ratbike look is pretty cool. The most I would do is clear of the dirt and rust and shoot a rattle can clearcoat over the worst bits
If the BB and headset are shot, then I wouldn't bother.