Ohhh my goodness, I've been sitting here reading through all 4 pages of this thread and really enjoying it, and cheering you on (in my head!) the whole time, and it broke my heart when you had to postpone your platinum vacation!!!

I'm really impressed with all your savings and weight loss so far - keep up the great work, even though it's probably twice as hard now that you've had to go through the disappointment of pushing back your travel dates.
Is there still any chance you might get to go in July like you wanted? (maybe possible job opportunities for next year have cropped up, or maybe you can do some networking with friends of friends, etc?)
Your posts have been really inspiring to me; I'm going to WDW in October and while my goals are smaller (weight loss goal for trip is 28lbs, savings goal is $2100), we're definitely working along the same general path! I'll be following your updates!
Final note: one of the most helpful tips I've ever heard regarding making healthier lifestyle choices is to go "choice by choice" instead of "day by day" or "week by week". Wayyy too often, I would screw up my meal plan/excerise plan at some point and be really hard on myself, and then resolutely decide I'd start again tomorrow/next week.... but the problem was, I would give up until tomorrow/next week rolled around, which added up to LOTS more bad choices. NOW, if I accidentally cave and get poutine with my friends while at the mall, or skip my afternoon jog, I am nicer to myself and become really really determined to not write-off any more choices that day! So the next "choice" that comes up (ie next meal, next possible window of time for cardio/weight training), I find I'm super motivated to get right back on track so that I still feel successful that day!

Maybe you're already a pro at going choice-by-choice, just thought I'd share the idea anyway!