You need all the wiring that's on the bike, PLUS more for the trike body as addition tail lights, maybe rev. lights, trunk light & maybe tow lights for a trailer.
You can remove side stand & bank censer, but the wires need to be splice together to close the circuit.
I'm sure one of the trike builder have post how-to, in fact I may have but don't remember.
Remove the center stand, but no wiring there.
Keep the air pump in case you mount new air shocks.