Kids, kids. Settle down.
First, a half-assed restoration will likely not raise the price and can have the opposite effect. There is a steep learning curve in restoration and real collectors can be very picky. Also, this cab looks to be in very good shape.
Sometimes people outside of the hobby have machines fall into their laps and don't have an idea about value. Many hope that they have found something worth a lot of $$$, but the reality is that market value in this hobby is what somebody will pay you. The market is small and knowledge levels vary.
There was a guy about a year ago on KLOV who was going to part out his Frogger cocktail because he couldn't sell it.
Having said that: "Frogger - Dedicated cocktail $350-$550. Collector price." Sounds reasonable, but may take a long time to sell (or could go very fast).
http://www.arcade-classics.com/exidy_arcade_price_guide.html