I'm posting this from an iPhone so I'll be brief.
I'm going to be putting the top on a bench seat. The seat will fit between two fixed pieces on either side and a fixed back piece. I'm worried about how to install a hinge -- I'm thinking a piano hinge -- such that all is centered when it's closed. It's hard for me to see how to do this since I have to install the hinge when the lid is up.
Do you attach the hinge to the stationary part first and does the hinge holes have any allowance for left/right movement until you get a couple scews in it?
Hopefully u can visualize what I'm getting at.