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Any chance your factory drawings list the rotor diameter?
No, sorry, it's a general arrangement, not a detail part drawing. Those dimensions would be listed only on the part drawing for the rotor or the machined casting, not at the top assembly level.
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The next question of course is standard or CDP track? I've seen pics with both, but wonder about the sole unit sent to NWE.
I've seen the unit shipped to Europe in CDP prior to combat. I think the available photos were taken in Canada prior to shipping to the UK for testing, after which it was shipped to the continent for service though they could have been taken in England. But it's entirely possible that the vehicle had the tracks swapped out for service with regular units as the CDP track were not used on Shermans so it would have complicated maintenance to have to manage one vehicle with CDP while everything around, except the SP regiments, had T54E1.
I'd use the T54E1, frankly, as the most maintenance friendly probability. Although if you like the look of the CDP, there's no evidence showing it was actually changed.
HTH
Paul