I am willing to incorporate any ideas you may have into the documentation or even create a separate document for just building the frame. Without building a frame from scratch myself, I can't guaranty an accurate job of it.
If this is a show stopper for you I will order a set of parts today and build a frame for the sole purpose of improving documentation. It will take about a week to get the parts complete the effort.
"If you didn't build it, you will never own it."