This is encouraging. I didn't fit well in an exige I tried out a couple of weeks ago, and I'm only 6'3, but if you can do it I must be able to! Also, your avatar picture makes you look like a giant.A number of threads on this, but in general it just comes down to trying one out to see.
In my case, I am 6' 6" and currently at 260 lbs. I have a 38" waist. I fit in mine well, have absolutely no problem getting in and out (top on and top off), and drive it pretty much everyday. Today I just got back from a 300 mile trip (weekend away with my wife) and was comfortable the entire trip. I have had my Elise for 3 years and driven it about 20k miles so far. I found the 2006 and later models to fit me better and this was because of the redesigned pedal box.