Before you join the top and bottom halves of the hull together it's a good time to get your choice of electrics sorted, I try and make the motor, battery and steering servo easily accessible and tuck things like the ESC and the receiver under the deck out of the way.
It's also a good time to look at ballast (notice the 2 small lead weights I have at the stern)
Notice that I have also drilled an access hole so I can get at the tiller, there is a laser cut panel that glues over this hole (silicone so I can remove it if I ever need to)