I was asked to make a desk for my grandson. It needed a "drafting tabletop" so he wouldn't have to bend over too much (better for his back), a drawer for his stuff, and A-frame legs. Well, such things don't exist, so I put together the plans from your Sawhorse desk, sawhorse storage leg desk, and some seat-of-the-pants engineering to create the final product.
The desk is still only 48" wide and 30" high. When laying flat, the desktop is 24" deep. The seating area seemed to work out (~23" wide) because this is for a child. I made the right 12" of the desktop separate and flat to serve as a place to lay books and things to the side. I used a piano hinge to anchor the liftable portion of the desktop. I used a 4" face so that the drawer would be sufficiently deep and more usable.
I appreciate the clarity of your instructions, particularly when I'm trying to adjust them for my daughters specific and challenging requirements.