It's worth more than all the fg you have. Full map will take at least 809K NP. At 1fg:5000NP that's ~162fg. Or if you're lucky, you'll find someone trading for 1:6000NP, which is what I sell at, and then that's ~135fg.
THEN you have to add in the fact that collecting the pieces is a pain the butt and takes a long time. So 162fg/135fg, you'll have to round that up. :(
You're better off looking at auctions and trades. Not trying to be mean, trying show some perspective. I've been going after full map too. I'm only missing one piece... ugh.