sounds like you are doing a pretty good job. -- While I have not built from ground up, I did do a full remodel.
I had plans drawn up by a draftsman, stamped by a structural engineer out of the area... and this caused me all sorts of pain -- mostly trying to communicate with the structural engineer. A lot of GC's in the high desert area grew up building homes in 1980's and don't understand the building techniques needed to comply with the 2020 codes. many of the GC's I requested to quote remodel couldn't even interpret the
confusing plans that the structural engineer created.
So, I guess looking back You can take the long road or the short road (either have it's benefits)
the long road is doing it yourself (owner builder style) and learning how to find/manage sub-contractors/inspectors, get the best price, plan revisions to get exactly what you want, etc..
the shorter road - hiring a GC with his architect who has experience in the high desert. these guys are hard to find (but perhaps doing some 4x4 driving up pipes canyon area would yield you a few builder names)
a lot of the better builders up in the desert don't advertise (don't need to) and have 6 month wait lists.
but the hardest part of the whole process (IMO) will be insuring the structural engineer is willing to understand 1) your goals and 2) san bernardino codes 3) communicate clearly throughout project
good luck!