I know others have pointed this out already, and the general consensus seems to be that the fixtures will randomly appear at some interval. I, despite having spent quite a bit of time playing the current version of the game with all manner of combinations of fixtures enabled from the workshop in an attempt to perhaps find a single mod that is causing the others to be non functional, have yet to be able to see a single of the workshop fixtures. I'm mostly just curious if anyone has a trick for getting things to appear, or if the awesome devs have made an progress in diagnosing the issues. I've been really wanting to get in on the screenshots being shared on twitter of designed cars, but it's a bit hard when workshop fixtures aren't available.