RE: Hatch options
Not to be critical or anything, but if you post a picture of the hatch, you would get more of a response as to how to attach it.
Anyway, normally you want two or more pins in the front of the hatch and then the Hatch Latches (sliding levers) on the back partion (in case you don't fasten it properly, it will have less chance to blow out in flight)
Turbulence.