My Frame and Magazine

Here is a frame and fork chopper set-up for a Royal Enfield Interceptor. I bought it from the guy who built the frame and painted it in the 70's. The springer fork is roughly 4 feet long (rear bar measurement). I love it, but I think the real bargain was the front fork. How do you determine what it is worth?

Also, I have an Easyrider #1 magazine. How do you tell if it is original or if it is a reprint? It's in good shape, but hard to believe that a paper thing could last almost 40 years.

Thanks,

Erik P.