This might be something obvious for those that have been doing Arduino for some time (as they use it extensively), but If you are not aware, there is this very simple open source tool called Fritzing that allows you to do simple but effective wiring designs.
This is the one from the Heltec Lora32 v3 GPS:
I’ve written a little bit about this here: Preparations for Meshtastic portable node
I hope this becomes a useful tool for our community… I will try to collect all the parts into a meshtastic repository so anyone with it can have all of them in pone place.