Sv650 makes a great track bike.

You can.

Just one problem, it’s addictive.

The first time out will be the most expensive one, you will have a time of you life and it would encourage you to go again as next time will be cheaper after you care of all the one time costs for the first day (suit, boots etc)

But then it gets expensive again, right Rocket? :lol

Edit: ^r6 tube should be about $10 shipped.
Talk to Boxersix about fabbing up a quick subframe for the bike.
There are cheaper lightweight batteries too, and you can mount them by the crank case to get your weight low.