I am 6'5" and 340 lbs. I can't fit in the Maliboomer (sp?) but everything else except the FRONT of the space mountain car.
I was placed in the front and was able to sit down (I used the trick of crossing your feet before you sit down) barely. I had my knees wedged HARD against the 'bulkhead'. It was actually very funny because i was grunting with every bump and turn (my cousin thought it was hilarious). The best part was the end, I couldn't stand up. I was completely wedged in. I started to laugh, uncontrollably. The CM didn't know what to do. My cousin was laughing to. The CM kept saying is there anything she could do. It seemed to last 5 minutes, but i think it was only about 30 seconds. I finally was able to stand up, but I was laughing sooooo hard. As I went to step out of the car I stepped to low and, you guessed it, I fell flat on the deck. This caused my cousin and me to laugh even harder. The poor CM was saying are you OK and (to her credit) somehow was NOT laughing. It was actually the best memory of that trip.
We went back a few hours later and this time I went in the second row and I fit no problem. The ride itself was much more enjoyable.