Lumber pile - the primary structural parts after cutting and sanding. I later decided to make curved brackets and slenderer crossbeams and kingposts for the hammerbeam trusses, which are not shown here.

All parts cut from various sizes of basswood stock on a cabinet saw(!), finished to length using a disk sander, and notched using a 3/16" bit in a router table - yes, I used full-sized tools to do 1/20th-scale woodworking. The angles for the truss components were made using a purpose-built inclined jig on the table of the disk sander. Note the 1/32" (0.8mm) bevels on the ends of the various beams.