Just received my Petrel kit and already stuck on building the strongback. I have diagrams with no measurements except one and I can't find a specific example in the book. I believe it's supposed to be a total of 12' long.
Here is what I have (wood parts) for building an internal box beam (advanced apologies for dumb questions):
4 x 8' side sections
2 x 4' side sections
3 x 8' butt joints
2 x 6' butt joints
2 x 2' butt joints
1. I know I am supposed to stagger the pieces for strength. Am I supposed to cut the sections and if so which ones to what length?
2. What the &*^%! are butt joints and where do they go? From the book, it looks like butt joints are for external strongbacks and not internal.
I either have too many pieces or not enough. Any and all help would be much appreciated.