I've personally seen several projects over the years that were good quality "glass" work, but obviously, the builder didn't know anything about electrical, and didn't seek guidance.
One particular case, I was asked to perform a prepurchase inspection and provide flight instruction to the new owner (VariViggen). When we opened the cowling and inspection hatches, I found extensive use of "Bell Wire" (The stuff they use to wire home door bells with).
I told the new owner that all the solid wire needed to be replaced with "Aviation" wire before "we" would fly the plane.
In this case, Solid wire , when used in an application with any vibration, will crack and break, randomly. (The old owner had indicated that over the years he found a several wire breaks and had repaired them).
This is a classic case of "Knowing what you don't know" then getting professional guidance.
With todays ability to access the INTERNET, there simply is no excuse.
Look at Stien Air, ACS, WICKS, etc, etc. Learn a little about Mil-Spec.
Waiter