Mine has stayed topless in the rain so far and just actually went to clean mine out after this mornings showers
Basically, remove (and keep out) the carpet. Pull the rubber drain plugs. Wipe off the dash and steering column. Shop-Vac the seats and anywhere else. You're then good to go. Luckily it usually gets sunny out once it rains in NJ so my seats dry out rather quickly.
Electronic wise you have little to worry about. When water gets into the defroster, it often just spill out onto the floor. The radio may be an area of concern if it's not a marine grade radio. You may also get the infamous stuck turn signal. If that's the case, just let it dry out, and spray it down with some elctronics cleaner NOT