Standard Double A Frame bolted then glassed into deck. I'll be skiing/boarding off mine with the addition of SS cable supports off D's moulded into deck near console. Jason's idea as a ski pole wouldn't be practical with the frame installed.
The mould behind is the one the 'green' rib came from (see later photo). There was no blemish seen on the mould.
I don't know how far down the manufacturing process the owner went before choosing to continue fitting out himself.