Great build. I hope other garage thread posters look at your build to see framing and shoring done. They needed it. Meticulous craftsmanship, kudos to you and your dad.

Couple questions, how much is it to extend your permit each year?
Also, in picture #1, looks like it will be a 6 point turn to get in the 16' door, especially a dually, is it the photo perspective?

For your 16' LVL header, one of my projects story:
I went from a 2x's with steel flitch plate to a LVL back in the day when they were filtering down to residential. Engineered with no deflection (has roof loads too). 23 years later there is sag. It could be specific variables with that house or old glue tech, and I still specify LVLs for other's door headers. But for future personal builds, I'm debating whether to add a flitch plate to LVLs as fail-safe support.