Reading over the directions I was a little confused how the gussets at the bottom attached. Drawing 10 bottom left corner shows this detail. Contacted David at TEAM and he sent me a good picture. The gusset simply glues on top of the other components which is what the drawing depicts.
This is something that is quite different than building R/C models. On models one typically tries to avoid “bumps” on surfaces and would inlay those gussets. Looking over the plans there are many areas like this. Following the wood grains depicted on the plans is a simple way to understand what part is on top.
When I actually get some things built I will post some pictures showing what these gussets look like.