I received my new Atlas Gunderson Multi-Max Auto Rack from Mr. Muffin's Trains today, (btw thanks Steve!), and have to say I'm really liking them, they're great looking cars!
I don't know how I managed not seeing the original announcement from Atlas for these until long after the reservation cutoff date, so out of the 3 I reserved I was only able to get this UP, one is better than none though. I'll be looking around for a couple more but it appears as if they are sold out everywhere I've checked already. Atlas, for us slackers, please offer another run of them soon.
Edit: I forgot to include an underside detail photo.