Ah snap, but racks are 18", and the 'bot is closer to 20". Looks like a Pellican 1630 would do it, though I'd have to get creative about how to get power and a spool into there while it's running. Plus the Pellican cases aren't meant to be used in an upright orientation. The EL30 is super close, but just a hair too shallow.
Sigh. A quick MDF box with egg carton foam inside might actually be the easiest option. If I wanna get fancy I can throw some wheels, handles, and corner-protectors on it, maybe even some kind of vinyl exterior.