Stock is 360, confirmed with my own stock Blast. This one is 320 with battery and pipe stacked on top of it (since they're not installed).
I dunno what I plan on doing for the undertail. I want to get some generic plastic to line the inside of the subframe and hide the wires/battery a bit. I prefer to keep the battery in the stock location, since it doesn't require additional metal. It also leaves that space open for other 'things' later on. 
Power to weight? No clue as I have no idea what kind of power it makes right now. I will take it to JTS for some dyno tuning once I finish this build.
