Entry door help, tutorial, parts....

Need to build the side doors..would appreicate any help for the following:
1.) keeping them flat w/ plywood, framing, etc.
2.) Door jam trim - like aluminum "z" channel, etc.
3.) Space around door.
4.) Hinges, seals, etc.
Photos would be great... I have some ideas in my head, but I'd really like to see what others have done. My walls are only 1-1/16" thick, so I don't have much room to play with - was actually thinking about buying a damaged screen door and seeing if that'd work cut down, etc.
1.) keeping them flat w/ plywood, framing, etc.
2.) Door jam trim - like aluminum "z" channel, etc.
3.) Space around door.
4.) Hinges, seals, etc.
Photos would be great... I have some ideas in my head, but I'd really like to see what others have done. My walls are only 1-1/16" thick, so I don't have much room to play with - was actually thinking about buying a damaged screen door and seeing if that'd work cut down, etc.