OK, finally got the sofa in after doing a ton of other stuff first. It goes so slow.
I built up the platform with a hybrid solution.
1) I built the torsion box extension and drilled that into the floating platform for the extension. Then skinned that with 1/4" plywood to match the level of the existing platform.
It still had a little give which worried me, it was probably fine. but....
2) I covered the area under the sofa for the extension and existing platform with 3/4" plywood that was 24" depth. Bolted that down.
I could stand on the extension and it barely deflected at all. So I am confident in the weight holding.
3) I bolted down the back of the sofa frame, I intend to lag bolt the front of the sofa frame as well. I just need to go again to Home Depot.....
4) I was able to use the seatbelt for one of the chairs, the second one isn't forward enough so if I need that I will have to do more work to move and install that one.
Pics here:
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