Thank you for posting this! I have a car that I need to do the rocker panels on, I'll use this as a guide, and I'll consider adding these 'internal subframe connectors' as I do it!
Eyeballing it there, I judged the reinforcement to be about 3/16" thick. (7 ga) I may see that front clip sgain in a month and I'll be sure to have a micrometer in my pocket.
I'll tell you what...... I have a 64 Valiant convertible and I've never had a 2 door Mopar where the doors sounded like this. They just close with a resounding CLUNK.
Occasionally people want to talk about my car at shows, the old "they don't build them like this anymore." Sometimes I just clunk the doors for them. I call it my baby Imperial. I've had (5) 67-69 cudas and the build quality was not as good as this 64. Comparing welds on k-frames, fit-up, things like that.
