Great info!
Thanks for the help guys.... gonna get a price on the Ikelite arms. I dont have a drill at all here, unfortunately.

Be careful with the lenght of the screws!
If they are - even slightly- too long they may crack the housing when you screw them tight,
so better shorter than longer..
I just made my own tray out of a ss flat bar for my Patima housing and the hardest part where to get the screws.
Two holes for the Patima housing ad 2 holes for the Fantasea flexarm, 2 rivets to fix the flexarm and it was done.
If you are not handy or have no drill just ask a workshop, thew will do that for a few bucks...
Chris
P.S. Where are you located to have trouble to find a Ikelite G10 housing?