Just a couple things I learned along the way that might help.
One thing to think about is choosing a dinghy that’s narrower than your boat. That way you can actually see behind you and it’s less likely to scrape other boats, pilings, or lock walls when maneuvering. I also tried to get the largest tubes I could find. Tube size makes a big difference for both stability and keeping wave splash out, especially since these 8-foot dinghies are pretty small to begin with.
If you haven’t settled on a motor yet, weight still becomes factor. You’ll need to store or mount it somewhere at the stern. And again hanging a lot of weight on the back is not a good idea. The lightest gas motor I found was the Suzuki 2.5 HP Outboard, which is about 29 lbs. That led me to look at electric motors. I ended up with the EP Paddle, mainly because it was the lightest option I could find at about 21 lbs including the battery, and the battery floats. Another advantage is you can remove it, bag it and store it inside the cave.
The only thing I don’t love is the tiller handle is a bit long, although they may offer shorter versions now. One nice feature is when you come into shore you can easily pull the motor up. With it’s microprocessor shutoff helps prevent prop damage the motor if it hits something solid, so damaging the prop is pretty unlikely, which is plastic. When I asked the designer about spare props, he said he had only seen one replacement needed, and that was from someone leaving the motor down in shallow rocky water and walking off.
Just a few things to think about as you decide what works best for your setup. There are always pros and cons.