This may not be an issue for you if you are replacing other electrical components or you have already mapped out the connections and you know you're good. Just a heads up...
The SIP loom seems fine, as long as you configure it exactly as it's designed, I guess. Using the same switches and such.
It seemed like a big pain to make it adapt to a 1974 American bike, with all the weird/unique things.
I'm just going to make one from scratch instead.