Skamp,

Love the design. Your pool layout looks very similar to what I built last year. We love the tanning ledge and the wrap-around bench around the spa. Feel free to take a look at my build previously posted. It should give you a since of what your shallow end will look like.

http://www.poolforum.com/pf2/showthread.php?t=5975

My only advise is to push the spa out of the pool as far as you can. It truly does take a lot of space from your pool. Good luck on your build and keep us posted.