Mike,

As others have remarked, it is a good start. Review Doug's kits and do a forum search on kits and kit contents etc. Set the search parameters to all forums and dates.

Off the cuff suggestions:
Two different types of fire starters and tinder.
Signal Mirror.
Compass.
There are many other items that could be added and it is virtually a certainty that others will chime in with various neat things to have in such a kit. I'm not sure how many folks that your kit is to support, but would venture that at least two would not be unreasonable, in which case doubling up on things is not a bad idea, i.e. two whistles, mirrors, knives, you get the drift...

Regards,
Comanche7