Easy solution to omnis, you will need the following:
- A kit wheel of your choice.
- Pool tube.
- Zipties.
Take the pool tube cut to go around the outside of the wheel. Cut down the middle and put over the outside of the tube using zipties every so often to hold the tube in place. Cut the ends off of the zipties and tada! You have a poor man's omni wheel.
My old team used these in 2005, 2006, and 2008 with much success. Good luck!
See an example wheel here!