You are on the right track. I don't remember for sure but i think thats where the belly pan cuts out. you need the 7a part for the pan etc....... as far as hinges i used dubro on the surfaces other than flaps. I generally use robart but tried different ones this time. I have a g-62 in mine and it's enough but none to spare. A gt-80 would be good also as you will need nose weight anyway.