Well that shitty particle board is always going to break.. My brothers make custom longboards out of different woods/fiber pressed together in my shop. They hate your idea but they are also pretty good and need their feet to move. (they race downhill and are good at slides and flat land stuff..)
I am like you, I suck on a longboard or skateboard.. I see the appeal, but you need a better deck and some kind of hand break as found on mountain boards. I won't longboard down hills because I'd like my flesh on the inside of my body, haha.