Simplified Version with X1 Subdivision struts and Vertical Base Option,Cupola and Face Intermediate struts.
The large triangles are divided again with boards (magenta colored) with bevelled and mitered ends, called Face Intermediate boards. All are same length and attached with screws, nails, and Strong Tie metal connectors. Used for supporting the cover of whatever type, these might be 2 x 2 boards on a greenhouse, or 2 x 4s along with 2 x 4 or 2 x 6 construction of the main dome struts. More may be added in areas with snow or high winds or as required to support roof materials. Here they are shown 24″ On Center.