Unless you just have to have this bike, I'd pass unless you can get it for no more than $ 100.00
From the pictures on Ebay, it's going to take you at least 2K and 6-12 months of labor to get it ready for the road.
Add these items up, tires, exhaust, spokes, maybe rims too, seat cover, chain, sprockets, new brake lines, rebuilding the master cylinder and disk brake caliper, replace the fork seals, maybe new rear shocks, new gages or replacing the gage faces, rebuilding the carbs, cleaning the fuel tank, new paint, and you don't have any idea if the engine will even fire up.
Tom