I talked to Matt "Misery" Washington on Saturday. I don't want to put words in his mouth, but it sounded like he was making progress on setting up the PXE server.
I tried updating the mirror over the holiday break, but had problems.
Supposedly I had downloaded the whole repo to a VM on my laptop. I transferred the packages to the apt-mirror, but somehow I'm missing 90 GB worth of archives.
We can try to download the files again, but it's going to take a couple of weeks to get it down.
What would help here would be 1) someone with a fast connection willing to help us download the packages or 2) someone with more apt-mirror knowledge than I have who can help figure out what went wrong last time.