yes, it is always great to see what others are building, so when you get the chance please do post pic's of your build.
Plus it does sound interesting. Wiring can be an issue for some and it is nothing for others. My best advice is think out the entire trike, all what you want and feel you need electrical...........lay it all out on paper or on the trike, get it all layed out and ready before wrapping it all up........that is if you do all the wiring your self...........there is the dunebuggy harness's that seem to do good for the trikes.
Winter is a good time for electrical wiring work, just watch out for the heater's, LOL
Welcome 2019, a year of progress......