I apologize if they installed new seats within the last month but I've kept my ear to the ground and haven't heard anything. We went just a few weeks ago and my husband, who has about the same dimensions, wasn't able to ride. It's not so much weight as far as fitting but shoulder width. He was just too broad to get in, and no modified seating was offered. We've been waiting to go back until a new seating system is installed which, last I heard, wouldn't be for quite awhile since it's a big undertaking and this is the height of tourist season.
There are two seating options right now with one a little wider than the other but for us neither worked. Further modifications are unofficially in the future so there shouldn't be anyone who has this issue.
Either way, try the sample seats and you'll be fine.