i see your missing the locking latch that goes over the fuel cap. i got one kicking around i will sell pretty cheap if you are in the USA. i dont have a key for it but a locksmith can make one.
Looks good. Here are a couple pics of mine. She's still getting work but she's almost done (for the time being). 1982 CB750k I pulled the windjammer off got a 1980 headlight assembly on her and rattle canned the paint because it was in horrid shape. I'm missing decals on the side panels but other than that she's cosmetically back in pretty good shape.. well obviously minus the front wheel still being off. I'm changing the brake rotor atm.