The last time I was at WDW was this past Feb.....I am 5'8" and, at the time weighed 305........I had no problems with anything. The turnstiles can be narrow, but I always went through sideways. Pull your seatbelts all the way out with one hand, BEFORE you sit down. This will make it easier to get buckled in. I rode Mission Space with no problems at all.
One thing I appreciate about Disney, after being to other parks (Paramount, Cedar Fair), is their attempt to make even the thrill rides accesible to bigger folks. Most coasters, etc. nowadays aren't made for larger riders. Seating is tiny.
However, I leave for WDW in 3 weeks, and am down to 270!:sohappy:
I'm really looking forward to going! I just hope Boma doesn't derail my diet!
Of course....all of this doean't help you......since I am a man! Sorry.