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Yep this is my Dart. It's a winters time project. Winter #3 will be coming up here soon and I'll be back at it. The 2 X 3 laid in this way fit great.
In the picture below the 2X3 shows where it comes though. Only at the rear floor section.
View attachment 1715587323
The driveshaft hoop I did like you mentioned, a flat plate on each end and then plug welded.
View attachment 1715587328
