My Subal D20 housing was just converted by Sam Chae to house my D300. Sam was in California and fine tuned his conversion kit for my housing by filing down some of the extensions, and shimming some others so it works just as smoothly as I had come to expect from my four Subals.
I've lost the CSM control, but that's not so important underwater. The viewing window is smaller than the rear display, but I've lost less than I thought, because the lower part of the D300 display is text, not image. I've put stickers on the left side to indicate the new functions, because the buttons have different functions on the D300. Otherwise, the look and feel is pure Subal/D300.
Overall, I'm very pleased and saved lots of cash over the cost of a new housing.
Thanks,Sam.