Looks cool. I used my Nik 5 in a similar way for street and other photography when I still had one. Although I never made mine over. It was also great (except for its weight) for bush-walking and the like. Years ago I used to scuba dive regularly (rather than once in a blue moon as is now the case) and of course owning a Nikoos was de rigeur for any "serious" diver. But truth be told, underwater photography is bloody hard and I was never successful at it mainly because I was reluctant to invest in the very expensive ultra wide angle lenses needed for really good UW work. However I found the Nikonos was a great camera for shooting above water so long as you could scale focus. I made a few trips to the battle fields of the Pacific (Peleliu, Guadalcanal, New Georgia, Shortland Islands, New Guinea etc) and found it was perfect for jungle bashing. It was so robust I never had any fear of damaging it.
I have to say your mod looks great. What did you use? I have seen that some people have tried using spray Plasti Dip "liquid electrical tape" (I think it is called) on cameras, which is a rubberized solution that would probably work well on the silicon surfaces. Is this what you used?