I have a 2009 Bav 38 ( manufactured in Dec 2009, launched Feb 2010) and the bathing platform seems to be the same moulding as you have.
The Platform was designed for hydraulic rams but as these didn't work in previous models it has been replaced with a spring lift platform. It is very neatly set up. I still have the flap over the emergency tiller like you have, but in my case, it does nothing but collect dust.
I'm sure SVB should be able to supply the change over parts required.
There is one line from the platform to a release lever on the boat. By pulling the release lever end, it unlocks the platform and then you gently push it down. When raising, you gently raise the platform with the line. The spring counteracts most of the force.
Installation of the parts appears straight forward.
If you can get the parts, I'll email photos of the set up for you to install.
Craig
"Shirley Valentine"
Gold Coast
Australia