Simplest replacement Wiring Harness.

[custom10nut]

I’m needing to replace the full wiring harness oin my 70.
I’m doing so because it’s just 52 years old, and there are a few breaks that I had to bypass and other splices that have been added, just to “Make it Work”.
I’m asking for those who have experience with this, and not a product/Company endorsement.
If looking for “the One” that is straight forward with simple, easy to follow instructions.
I’m not looking for the cheapest, but the most sensible.
And then from the members who have done this, any advice or pointers to make it a seamless task.
Thanks in advance