If you leave it without a coating it will rust yes. The best thing to use is a wax or polish on it but that will require maintenance which would mean removing the tank. Alternatively you can put a couple of coats of clear paint over it. You will get stone chips and cracking but it will give a bit of a protective coating.
You could modify the 63l straps but if you are going to that trouble i would be just making some new one's up. Let us know how you go
What's the difference between understeer and oversteer? Understeer is when the driver is scared. Oversteer is when the passenger is scared.
firstly (dont leave the tank uncoated) if you got the bucks your could get it chromed for around 150 but other wise just a fresh coat of paint will protect it! also buy the straps , dont make them up unless your a qualified engineer that can give and sighn your own reports...(other wise its a defect straight up) not just that you would save your self alot of time and bucks down the track......