Agreed, call and find out about the laws. In Ohio there are specifics about who can bring a salvage title vehicle back to road spec titling, and it will be noted on the new title that the vehicle came from a salvage vehicle.
As for the bike, the carbs should have the bowls removed and cleaned before attempting to start it. The tank should be drained and inspected for signs of rust.
All the dried gas **** that will plug jets will be in the float bowls waiting to turn into gum when new gas comes into contact with it. Removing and cleaning the float bowl area is the vital trick to try to avoid carb tear down. If he's been running it, if it runs good off choke when warmed up, you're good to go.
I agree on the tires, but not so much on the chain & sprockets. The tires on it will work for a test ride, provided there is no extreme cracking, but they should be replaced virtually immediately. The chain, if not showing signs of rust and difficult or immovable kinking should be fine if there's not much wear evident on the sprockets and with the "3 o'clock" pull test - pull the chain back at 3 o'clock on the back sprocket. If it lifts far enough to see under it, the chain is shot.
As for the refurbishing, the Seca also came in a model without the fairing. A simple headlamp set up can be put on the forks and a set of instruments on the triple clamp if they aren't already there. Make sure the rear subframe isn't bent beyond simple repair. Since it's a mono shock the subframe isn't hypercritical to be perfect.
The Seca is a great standard bike with or without the fairing. There was even a spec series roadracing class back in the 90s for a while, promoted by Yamaha. It sounds like a possibly good buy.
I will say I never recommend a bike that needs serious down time to fix and will not in this case either. Nothing worse than having a bike you can't ride, especially if you're a new rider. I bought my Zephyr with some issues, including really junky paint, but it was ridable almost immediately. I still haven't taken time to do the tank paint yet... still riding.
In other words, if it can't be on the road virtually immediately don't bother. It'll take the fun out of motorcycling for you to have it sitting there not ridable. I've seen it before in my years at the bike shop.