Only asking from experience, but make sure the guys are framing your main structure tall enough that your shorter awning will still fit a camper under it. Most 30x40 buildings are 12' wall height, which isn't tall enough for what you've got in mind (don't ask me how I know). That said, the pic representation of your building looks probably tall enough if that's a 10x10 door. But worth checking what they think the center height of the awning area will be - center is the max height of most RVs because that's where the ACs are mounted. 13'6" is max road height, although most bumper pull trailers are around 11'-11'6".

Think I'll come out some late night and secretly plant a metric chit ton of (live oak) acorns all over your property.

Progress from today Day 3 I think: