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Thanks, but I have rocks. Send the snow to the ski resorts in Tahoe. This is a really interesting challenge, and I shall overcome...... failure is not an option ...... death before dishonor, etc., etc.
My spare parts boxes have yielded some possible parts for this project. Some may work with a little modification, but I think some "square one" scratch building is in order. I can make a styrene master for the suspension mold and cast resin copies. The road wheels will be cast resin copies of Mato Sherman road wheels that I can modify to match the road wheels on the M2A2 and the T3E4 tractor. I have some resin track strips that can be modified so that they will be an exact copy of the track on the real critters. Things are looking good so far. I think I will continue further in my investigation of how this thing will have to be accurately built. Much to my surprise there are a lot of photos and info about both of those tanks on the internet.
If anybody knows where I can get a 1/16 model of a radial aircraft engine, let me know and you will be my new BFF.
Here's my starting point, I will try to do a build thread as things progress .

rex