I have found drawings of both types of chassis from Maple Leaf up Forum and from the GM Heritage Centre website. I have grouped them together for comparison. The CMP chassis is a generic view and needs to be 33"s longer I think, between frames 3 and 4 to become a 134" chassis, but its the clearest view for comparisons sake. The most obvious difference is the angles at the front of the chassis with the MCP chassis having a more downward pointing end to the frame. This, I presume, is to accommodate the I beam axle for 2 wheel drive as opposed to the driven front axle on the C30 CMP chassis. There are other differences such as strengthening gussets on various cross members of the CMP chassis, as well as the lack of strengthening plates on the mid section of the CMP chassis. Despite my research I haven't found the width of the CMP chassis (more likely didn't notice it when looking for other details). I know the MCP chassis was 25-7/16" at the front and 36 at the rear and had a wheel base of 134-1/2". The MCP chassis diagram isn't great but ok for comparison. Ideally a better diagram would be helpful. I have attached another drawing to show the MCP strengthening plates on the mid section of the chassis. Hope that helps.
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