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Hello Nick.
Welcome to the forum and Thank you for your PM.
As long as I know, no detailed cowl drawings for the models you are searching for are available.
I have ever seen such one for A6M3 only before.
Best way will be to cut and trace the overall 3-views like from the followings.
Ki43ii
Ki43iii
a6mzero
Good luck!
Details of the first Japanese list are -
"Type 1 12.7mm machinegun x 2" is for Ki-43 Ic(hei)
For Ki-43 Ia(kou), it is "Type 89 7.7mm machinegun x 2" with ammunition 500 x 2
For Ki-43 Ib(otsu), it is "Type 1 12.7mm(ammunition 270)" x 1 and "Type 89 7.7mm(ammunition 500)" x 1
Thanks.
View attachment 183259
Here it is, Segment.
Was not easy job
As you mentioned, Segment, Ki-43-IV with Mitsubishi Ha-112-II engine was planned as a half-wooden plane but not manufactured as war was over.
There were 2 prototype Ki-43-III-Otsu(=b) equipped with a pair of 20mm cannons but the engine was same Nakajima Ha-115-II as Koh(=a).
Your understanding is correct.