Thanks all for the kind words and luck - hopefully I'll adapt quickly...best to do it while I'm young, no? 
it sure cleans up the rig to not have the manual controllers adding to the bulk of the system.....are you planning on using a focus light?.....how are you going to mount it?.....
Re: cleaning up the system - I love how it's a little less cluttered as well, both aesthetically and logistically. With regard to a focus light, so far I've just been using the light on the DS-125s...I figure if I get desperate I can either a) rubber-band a small light under the macro port, or B) purchase a ULCS triple-clamp and mount it right above one of the arms...
Be sure to lightly grease the port o-rings....it makes changing ports a snap....you've probably already done it, but be sure to go thru the mounting sequence for all your lens/ports/sleeves/zoom gear before you leave on your trip...
Interestingly enough, the ports slid in without too much resistance whatsoever. The macro was slightly more difficult to set in, but the #5503 was a piece of cake.
the other tip I might add is to make attaching the sync cord to the rear of the housing your very last task as you assemble your rig.....you don't want to have it attached when you lay the housing on it's back to change ports....
Same procedure as with the 5050 setup...I'm not sure about the tolerances of the cables, but even in packing I'm very hesitant to ever position them in a manner that places the cord right next to the connection at any angular bend...not sure how they take the stress? :-
Trying to get *everything* packed
I realized that I will *not* be able to take any of the old C5050 setup...no room 
So far, I've noticed one problem. It's not even a problem really, just a small annoyance. The TTL cord inside the housing, when attached, is pushed against by the Mode Dial (even when fully pulled out) when putting the housing together...*so*...I just stick a pencil in through the front to hold the cord down until I slide it past the dial. I guess a different solution is tape, but not going to worry about it since it works fine.
A few more pictures just to tempt James some more :wink: :


1/250, f/13, ISO800, 100mm, single-strobe eTTL2

1/250, f/20, ISO800, 100mm, dual-strobe eTTL2 

Straight out of camera, no flash compensation, USM applied and resized. Considering these are *highly* reflective surfaces...I don't see *any* problems whatsoever when using this on sand...we'll see 
BTW James - no way in the world I'm going into my freezing cold pool right now...lol...
~Matt Segal