Great pics B.W.! Great to see someone else working to save a cab! Would love to see more pics as your work through and finish. Any chance you can send some links to the threads you say have the steps? I have seen a few threads about the topic but did not see a step-by-step yet.
I bought a little endoscope that was able to fit in between the two roofs (fished it up through the hole for the visor) and was able to snap a few pictures of the inside. Great little gadget. Only $35 on Amazon. Hooks to your phone wirelesssly. Very easy to use. In case you are interested:
https://www.amazon.com/Depstech-Endo...era+with+light
Anyway, Looks like the top (outer roof) is worse than the inner roof. First shot is the entry point then next two shots are on the drivers side looking down towards rear along the seem. Other two shots are the front. Blueish tint is the top (outer) roof. Doesn't look too bad at the seem, but would be interested to see what you and others think.