i sort of tried that.. but it was dark and i needed to go out to dinner.. didnt work.. need to really try that tomorrow.
here is the stuff you will need to fabricate for the back seats. you need to pretty much cut everythign out that holds the existing seats in. its a serious project.
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this is the center support for the folding rear seats part #1.
this is the black piece that holds the seats in place and screws into part #1.
ths is a pin that slides into the sides of the rear seats closest to the door
this is a hook that hooks onto the lower portion of the seat (the bench part) these dont fold forward like the mk4 seats. the bench stays flat all the time. you can see this part in the photo above. I think it might be for a carseat or something.
and you need to make or move the hooks that go on the top of the seats (where the latch is) i would not weld anythg to that sheet metal there (I cannot imagine its very strong), weld to the existing one or weld it to the frame. cut the sheet metal away, weld in the hook and then weld the sheet metal back in place, paint etc..