Mike,
You have come to pretty well the same conclusions that Tommy Burns did when he wrote a paper on AA tanks for the AFV Users Cttee in December 1942 (hence the Skink - which had a very high rate of traverse, although they never did complete the development of a sight to engage high speed targets before it was cancelled.) In addition open topped AA AFVs were considered just too vulnerable to ground attack a/c.
Canada was not too warm and fuzzy either about the truck mounted Bofors twhich he British Ministry of Supply ordered in September 1942, and only adopted them in September 1943 in order to c0onform with British scales of issue.
The problems you describe with levelling, and with crew accomodation were also the downfall of the 3.7 inch Ram SP.
Yes I have lots to say on the David, and the Canuck gun as well.
Roger
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