Thanks for the comments everyone. I'm really glad Adan was as excited to do this as I.
As for blankets, I had two, Adan had one. Two isn't as bulky/heavy as you would think...still tons of room in a GoLite Jam.
I was plenty warm on top. I'd estimate the temps were in the mid 40s. I started by the fire and was absolutely fine until I started getting smoked out really bad; I was on the wrong side when the wind shifted the smoke low. I don't think Adan had any issues with this. But the fire made a HUGE difference not just in air temperature, but in the temperature of the sand we slept on. When I moved my bed due to smoke, the sand I was on had to be at least 10-15 degrees colder. I was able to manage by wrapping the blankets under me, but the ground was definitely the greatest source of heat loss. Had we wanted to go full-on bushcraft, we could've easily gathered a lot of brush, leaves, boughs, etc. but we didn't want to tear the place up...there wasn't much deadfall/litter suitable for bedding so we stayed pretty LNT.
Had I been less lazy and remade my bed, a doubled blanket below me and one on top would've probably been best. I think a single blanket down into the 40s would be fine with bedding below. It could probably go even lower if combined with a shelter, especially an insulated deadfall style one.
For reference, I wore canvas pants, a cotton t-shirt, a cotton flannel, wool socks, a wool hat, and wool gloves to bed.