I'm curious what cases people recommend too, although maybe this warrants a separate thread because I'm less worried about fees and more just about minimizing potential mechanical issues. (I have an S&S touring bike but it's not the one I would want to have at PBP/another grand brevet.) What would people recommend if I don't want to have to remove my rear derailleur (and would prefer not to take the fork apart though I'm fine taking the handlebars off the stem)? Basically I am terrible at lining up derailleurs and really, really want to have all my gears on a grand randonnee. 51cm-ish bike with 700c wheels, so on the small side but not super-tiny.
The crateworks
https://www.crateworks.com plastic box looks kind of tempting -- it's basically a corrugated plastic version of a cardboard bike box with a few built-in tiedowns.