Nice, now look for the head pipe and all for the Cobra and you'll be set. I've built my S as far as it'll go so far on the stock top end, without boring it more than .040 over. Cam, carb, pipe, 10:1, and plenty(!!!) of hours of tuning. A good upgrade is the carb from a second generation 200X, really open it up, coupled with the pipe.
I wish mine looked as nice as yours though! The old girl's minty, nice, OEM fenders were split along the bend a few days ago by a accidental kick. Oh well. Still one of my favorite bikes as long as your kidneys are made out of weapons grade titanium!
This is my trike. There are many like it but this one is mine. My trike is my best friend, and it is my life. I must master it as I must master myself. My trike without me is useless. Without my trike, I am useless. I must ride my trike true. My trike and I know that what counts is not the amount of miles we ride, but the time we ride together. My trike is human in it's own ways, therefore I will learn it as my brother. I will learn it's weaknesses, it's strengths, it's parts, and it's soul.