That's a pretty interesting idea. I'd tinkered with a few concept drawings of a PSK where much of the equipment attached to the outside of the case so that I could utilize the waterproof interior for things that need to stay dry like fire starting supplies or undamaged like AquaPur Tabs. I never had the money to follow through with the designs though.
The main issues I worried about were damage to an externally attached mirror and the thought if I lost it, everything was gone. Regarding the latter, I figured that if you lose just about any PSK, you would probably lose most everything anyway.
Other than that, I think I'd prefer that the whistle and flashlight weren't part of the knife. I want a whistle that I can hang on a lanyard around my neck for quick and easy access. I also have dropped many a knife and flashlights and even lost a Maglite in a river so I'd prefer if those items weren't part of the same package. But that's me. I like to make everything as idiotproof as possible for my own good.
Still, it looks like a pretty nice kit.