Long time no see. I wondered back here to look for ideas on how to make a cheap blue dive light for fluorescence diving and noticed this old thread.
A small update on the camera housing. After the Philippines trip I had the camera with me on another 6-week trip to Indonesia in 2015. The housing worked excellent. If I remember correctly I machined a new even thicker polycarbonate back cover to replace the slightly cracked old one. Next month we are leaving to Mexico and Central America for three months and I am not yet sure if I'll take the housing with me. We may not be diving as much as before and the housing is kinda bulky to carry in my 45 liter backpack. Fortunately I am still using the E-M5 so no need to update the housing due to a new camera.
I did plan to make an optically synced strobe for the housing but never got to it and definitely do not have the time before the next trip. I might buy a decent dive light and fix up an arm to attach it to the camera. That might already improve the photographs a little.