If you have all that just laying around it’s probably a deal. These cars are easy and fun to put together. VW steering and pedal set can be used (usually). Good gauge sets are $700 from Beck. I think the Speedster windscreen setup is $800(?). The lights, mirrors, fuel filler and some other stuff is spendy but a lot of other stuff is optional. Since you’ve already built a bunch of cars you’re certainly more qualified to do this estimate than me—and most of us!