The good news for me is that she has been wanting this more than I have. My two reasons are not wanting to burn any more gasoline than I 'have to', and of course the high costs usually associated with boating. Once I tested the waters last year with an approach that avoids both of those downsides, and seeing potential for more, I was much more fully 'onboard' with the idea.
Here's an example of the kind of workups I've gone through. Take the Boston Whaler 110 Tender, their smallest boat, and the only one I see that you can buy (new) without a motor:
https://www.bostonwhaler.com/family-ove ... 10-tender/
There's a very affordable 20hp electric motor by Stealth. Never mind that the 110 Tender is only rated for 15hp; their Sport model is the same boat and rated for 25hp. I think the difference is tiller versus remote control. One could buy a 110 Sport with the smallest motor they force you to buy it with, then sell the motor (at a big loss no doubt) and not have to build your own console/steering setup onto the Tender.
The weight capacity on the 110 Tender is 845 pounds. Take off the 400 pounds for motor and battery (per earlier calculations) and you have 445 pounds remaining. There's a four-person capacity, but you're not squeezing four people into 445 pounds. So the batteries have taken up about 1.5 persons-worth of capacity. I.e. after the ~360 pounds for us two, there's less than 100 pounds left over. Dropping to 15hp gives back 100 pounds and thus a third person is then an option. Of course now top speed has suffered. This is the big challenge I'm facing with this project.