1 get a 104hp 6u rack - maybe tiptop mantis - but check with the airline that the dimensions are good to go - I know they are in the eu, but not sure elsewhere - and remember to pick up the case - it's cheap and poorly built but will get you going
2 find an actual store near where you want to go - one or all of these 3
Analogue Haven (Los Angeles, CA)
http://analoguehaven.com
Big City Music (Los Angeles, CA)
http://bigcitymusic.com/index.php?main_page=index&cPath=1_18
Boutique Pedal NYC (San Diego, CA)
http://www.boutiquepedalnyc.us/eurorack-modular/
and check what they actually have in stock - probably not a lot of time to order things in if they don;'t have them
3 some of the modules you have in the rack are not easily available anyway - so that makes things a bit easier - giekses nodrums may not be available (think he only sells from his own site, but may be wrong), snazzy dronebank - and the maths you have there is the old version - so i'd ditch all those and
4 you probably don't need both the turing machine (if you could find a built one) and permutations just get marbles!!
4 I'd really look at kinks - it's really useful in 4 hp - the same for disting - which even has a pitch follower and a tuner, both of which maybe useful
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities