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Thanks to everyone for the comments & kudos.
In the interest of saving money, I tried to do as much myself as possible- designed & built/bought the tray & arm parts, boiught an older strobe on Craigs List, and used an HW adapter to convert the camera flash to strobe TTL.
Total $$ was about $300 for the strobe addition shown.
Camera: Canon A720IS, Housing: Canon WP-DC16, Strobe: Sea & Sea YS-90TTL w/ Nikonos cable, HW Digital Adapter, Fantasea Nano Focus Light, Arm/Tray Parts/Material: McMaster Carr
I put some pic's of the setup in this gallery;
Thanks.Well done! Doubly so with a DIY rig! You got a lot more than your money's worth with that. Did you do any post-production on the stills with Photoshop, etc., and how did you do it?