Good point. I've been trying to figure out how to mark top and bottom of shell and line them up properly. As with many of the projects I've done, there will, no doubt, be a lot of planning that will probably all change to modifications on the fly once I get started!
I'm going to do some more reading, planning and studying until I get my head around things a little more.
If anyone else has any suggestions or have found any other guides/instructions, please let me know! Thanks