M60 wading trunk questions

Greetings, Google hasn’t been of any help…I’m wanting to build a wading trunk for a 1/16th M60A1.
I’ve got pics from a TM. What I need is: What is the OD dimension of the trunk and how tall is it (from the exhaust vent duct/shroud to the top of the main pipe?
Any info is greatly appreciated, Thank you.

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