Airborne Intamin Vertical Lift Coaster

Well. After a year of getting to know the software, I am finally getting serious about making coasters. This one is obviously inspired by Fahrenheit at Hersheypark. I am open to feedback and I would like to have this up on the exchange by August. Its not quite done yet but I'm stuck. My computer is having problems with uploading pictures so I made a youtube video of the pictures.
http://www.youtube.com/watch?v=hb8GPLbb ... tube_gdata

Tell me what you think. I know its kinda tough to see smoothness but shaping and layout tips would be nice.....also, I was wondering if I should double spine this track like Skyrush or leave it how it is

I would not double spine it because the coaster type is fine with a 3 tube track. Double spines seem to be used on taller coasters.

For the shaping:
I would tighten the immelman; the top of the element looks like it would cause many negative G's.
I would also straighten the heartline a tad before dropping on the roll after, what looks like, the MCBR.

Keep it up!