I would suspect similar to C15A truck.
Doesn't the C15TA manual have a diagram? Having looked at a number of wiring diagrams and actual wiring harnesses for Chevy CMPs I would suspect that actual wiring diagram and harness will be very similar to C15A, C60. What I have noticed is that the front harness which is the core of the harness is very much the same be it a C60 or a HUP with the difference being in the rear harness that starts at the frame cross brace that holds the transfer case.
As to the materials to make up a harness, there are various sources of the cloth covered wire with proper color trace patterns but with copper wire and modern vinyl isolation along with companies that can weave the thread loom around the wires into the general harness.
It will be interesting to read what earlier restorers of C15TA (s) have done for wiring harnesses.
Good luck and keep us posted
Phil
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