This is a tip that i think can help a lot of folks.
Don't take things so seriously. Its a DIY project and it doesn't have to be and exact replica of what your copying. As long as the footbox triangle, shelf, end cap, tarp door, whoopie sling, locked brummel eye loop,... is close it will work and it will be a custom design. Too may DIYers want to know the exacts and that is the whole fun in the DIY stuff in general. We all make mistakes and some times that is a good thing. WD40 was a mistake.
Take it easy and enjoy making your own gear.