I recently converted my Ikelite Nikon N90 Waterhousing to fit my D200.
I had to remove all the nobs and actuators and sealed the openings. Then simply added a trigger release to the 10 pin adapter. Holding the trigger down halfway focuses the camera and registers an exposer. Then fully depress to fire.
The obvious problem with this housing is having almost no control of the camera's functions. I find I prefocus before putting it in the housing usually. I mostly use it for a splash housing for watersports and fishing shots.
I simply figured that I had it sitting in the closet for nearly 3 years and did not feel I could get my monies worth for it by selling it. So, it only took me two days on the work bench to figure out the logistics.
I have two more in the closet that I would be willing to modify if anyone was interested. Again, extremely basic operation but a quarter of the price.
Let me know your thoughts.