I store my Torqeedo outboard on the floor of the cave. I put it inside a golf bag travel cover for a little padding. Torqeedos have been thoroughly discussed in other forums on this website, but I've found mine to be an excellent choice for this type of boat. Briefly;
Advantages;
Can be stored securely and out of sight inside the cabin,
no gasoline fumes,
no need to find a place to store gasoline (gasoline should never be stored below deck on a boat without a bilge blower),
quieter,
"greener",
and cool GPS function that shows speed, power output and range on remaining charge.
Disadvantages;
Costs twice as much as a comparably sized gasoline engine, and
Can require up to 10 hours to fully recharge.
Here are my "specs". I have the Torqeedo 503 model and an 8'9" Maxxon inflatable dinghy with a slatted bottom.
Motor weight 28 lbs.
Maximum speed 3.6 knots (Range on full charge 2.2 Nautical Miles; about 35-40 minutes)
"Cruising Speed" 3.0 knots (Range on full charge 6.5 Nautical Miles; over 2 hours)
Recharge - Approximately 1 hour for each 10% discharge; i.e. if my battery is 70% charged, 3 hours are required to recharge.
Charging power; 30 watts (per the display on my inverter) or about 2.5 amps, so a fully discharged battery would consume approximately 25 amp-hours from your house batteries. Preferably, I try to recharge mine when I'm running the engine or plugged in to shore power.
Good luck with your decision!