Get on it buddy, looks like decent fairings. Carb rebuild and sort out some wiring and you're away.... so you could probably turn some profit..
Or wait till we come down for the Triumph ...... buy it and ask if he can hold it for a couple of weeks .... tyres look good on it from the pics also
The question is, WHY? Why swap familiar with unfamiliar (Read unexpected problems). Better the devil you know IMHO. Unless you know the history of the bike. I.E well documented build thread on 2fiftycc.com. and I don't see one......
Yup ..... keep commuting on the Ninja and when the project is done , registered and going , sell off the Ninja.
Before you do anything, take one for a ride and make sure it rocks your world... then post some pics up of your new toy