Having done the same thing with the same type of bike....more than once, I'll offer up an opinion. This is my folly from a few years ago. It's been fun to ride around the block, my boys have enjoyed it and I've collected some period parts to hang on it at some point. In the end is just an old Roadster.
I'd say go for it if it makes you happy. Restored or left as is, you'll be upside down if you try to resell it so the motivation has to be for the love of the bike. I have a soft spot of the roadster turned racer. Someone had fun with it, I see no reason for you not to have some fun too. This is not an appraisal but the price is favoring the selling on this one but it is really cool....to me anyway.