After dropping my first camera in a pool of seawater I thought 'well this might happen again and I can't afford to keep buying cameras indefinitely' - so had a little think and came up with the little beauty in these snaps.
I used a cheap lunchbox which has a seal, and a couple of 52mm filters. Because the means to actually build it are somewhat out of my range, I asked a mate who has a workshop and many years of experience.
A ¥100 lunchbox and my elderly Ricoh.
Mark the centre of the lens
Two 52mm filters. Remove the glass from one and set the metal threaded ring into the circular hole in the case.
Cut a hole in the case to drop the metal ring into.
Hot glue the filter mount into place
Hot glue the internal locating pads
Thin stuff over the lcd, prevents camera controls being accidentally pushed while inside the box
It might look chaotic but everything in there has its own purpose. Also has a pretty nice tablesaw, lathe, bandsaw, shop extractor. He has a metal shop upstairs - all of this is crammed into a basement.
Aluminum plate drilled, tapped, ready to be screwed onto case and hot glued to guard against water ingress. You can see that a multicoated protector filter is fitted to the mount; I could also mount a polariser in place of the protector. I have started using a 52mm metal lens hood to save on continually trashing filters!
Et voila! Think the camera alone with a battery is around 190gr. So not too shabby.
The only thing I haven't done is a way of connecting a safety cord, just thinking about that now. Just using gaffer tape to secure those end catches while the camera is operating.
Hope this is useful to someone!