We ordered ACQ pressure treated lumber. 2x12 is easy to get. Anything larger than that requires special orders and longer turnaround time.
Every piece of lumber were measured twice, cut to length and numbered.
Bolt holes were measured, marked and drilled.
Most beam and girder pieces were notched with plunge router.
Then sanded with belt sander.
After days of teamwork, all lumber components were prefabricated and ready to be assembled into beams and girders.