Spin construction bug happens shortly after 1:38:14 IGT, 2:10:50 VOD time. The game consumed the materials and Source, but the weapon didn't get constructed, but I did technically still construct it.

Sub 1:45 doable I guess, I'll be trying to get it for a while, but not sure if I want to extensively grind this run atm, even tho it is a fun category.