Projects are hard to value, but it's definitely worth saving. There is always strong demand for Volkswagen Beetle so there's a good chance this kind of project will appeal to someone. Good examples can go for £6000 - £7000, but for a project you're probably looking at around the £700 mark - but these guide prices reflect the UK market. You don't say where the car is based, so the best thing to do is have a look for a similar model in similar condition local to where the car is. That will give you a good idea of how to set the price.