bvanant

I think that for most prints at shows that I have seen, there is a cert of authenticity on the back of the print, and often a label attached to the framing. Some local Los Angeles galleries have little embossed foil signatures that they attach to the print but to me that is a way to make a print look cheap. If you do sign on the front, a small signature in pencil will be appropriate.  If they are of a numbered edition then do the x of y thing, also in pencil.

Bill

Do you mean the attachment for the port to the housing, you would need some way to accurately capture the glass/transparent element.

My belief is that ABS would be fine for a relatively thin extension perhaps (but you would need secondary machining for the threads) but not for say the collar for a big dome port.  Anyone have an FEA handy.

Bill

Dimensions of the inside of the housing will probably be more useful than a photo. There are quite a few strobes that can speak iTTL I think.

Bill

I believe that some olympus housings (if you are using electrical sync) use the underwater mode to allow the flash to fire even if it is down.  If that is true you are stuck using it that way I think.

Bill

I have some photos unfortunately, send me your email address and I will send them.
Bill