I have broken all the hinge rules on my last two projects, a Goldberg Extra 300 and a GP Extra 300S.
I have made the slot a touch bigger and have used Titebond glue. I tested both the plastic hinge on the Goldberg and the ca hinge on the GP in a block of balsa stock and when left overnight I couldn't pull them out with a pair of pliers.
Keeping my fingers crossed
Bob