I must say, for less than 80 bucks, thats awesome! Really does change the look of the GZ. You are more than welcome to post any of your 'how to' in our designated section. I am sure many of the members here would appreciate it. I would be really interested in how you reshaped the fenders.
By the way, that bike would look really neat flat black
As for performance...isnt really much you can do to the 250cc motor on these. Other than the needle shim and changing the pipe (see the how to section for both of these). Other mods can include lowering the bike (lower shocks or hardtail it), wider tire, bullet headlight....things like that.
Looking forward to more of your pics and whatever else you can post up about what you did to your bike. Great work so far!