Robyn - I have some great plans (very detailed) for a rainbow slider. With material list and everything. E-Mail me at wakestar@gmail.com and I'll send them back at ya.
I will be building both floating and Permanent sliders next month. I will email you photo's, material listing, and blue prints(not yet drawn). Hope it isn't to late by then. Good luck
Id say forget a kicker and build two diferent rails. what tricks can u do on a kicker that u cant do off the wake u know? id have an A frame and a flatbar. A frame with 30 foot uphills on each side with a 20 foot cross flat up top. flatbar just make sure its 40 foot of flat otherwise it will be too short but if its going to be for beginning divission id put 10ft uphills on each side making it 60 ft.