I know, I rode it a few times with the stock wheels and even at lower speeds it felt like it would tip over. I think they made that narrow to fit through a standard house door, but I don't bring my bikes in the house so wider it is. I had been thinking about making it electric, but I changed my mind. I am however going to make it multi speed rather than the stock 3 speed. Lots of small hills around here. And even more gravel.
I look forward to seeing a fat tire gravel trike!! Mine came equipped with 5 speed derailleur & is a blessing on hills. Just can't do e-bikes. Gotta pedal. I'll get around to upgrades one day.....
Have fun with yours!!