Brian,
Good Show! It's good to see you taking your time to prevent a lot of extra work.
Your first question: from memory, 10 "biscuits" or insulators sounds about right. I will do some digging and let you know if that is not the correct number. Make a diagram to show their location. I'm not remembering any documentation showing their proper location. Most frames have extra holes to confuse you.
Second question: Yes, an extra sheet metal thermal baffle has been tried and there is a marginal change. It seems the most significant heat source is the exhaust pipe at the toe board. There is little that can be done with that area without it appearing Mickey Mouse. Suggest you consider the use of modern reflective insulating material under your carpet at re-assembly time. Dynomat or equivalent, works better than tar paper and jute.
Keep It Rollin' Tom
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