I'll give a big thumbs up to the zega cases, although mine haven't done loads of long distance they get regular use since I scrapped my car and they remain easy to use. With 2 weeks to go have you got time to get hold of some + a frame and mount it all up? Toutatech took a week to get mine to me and they are the standard 35l and 42l ones - Are you looking for the GS pre-shaped ones or not? Might be quicker if not? Don't underestimate the time it takes to fasten it all together onto your bike aswell...
I'll try anything once, twice if it didn't kill me!