I have a 1947-1952 Grumman Engineering Corp. Bethpage made row version dinghy D-143. It is missing the aluminum support for the middle seat and I’d like to fabricate the original design. I'm looking for a clear picture and dimensions so we can recreate it. Please let me know if you might be able to help.
Here's a photo of what I'm looking to replicate:

And here's a photo of what I currently have:

Thanks so much.
Paul
Here's a photo of what I'm looking to replicate:

And here's a photo of what I currently have:

Thanks so much.
Paul