I'm 6ft 2in, 230lb and I've daily driven an MX5 for 9 years and 200,000km
Mine is a '90, and I fit just fine. There is enough head room, leg room, and arm room for me. Maybe you are wider than me? :P Or perhaps you were in a later car? I know some of the NB cars are a bit tighter inside.
I found with the stock wheel, I had to stretch my arms out a bit much, and wrap my knees around the steering wheel a bit. But this wheel is a lot closer, which is great, and gives my knees loads of room under the wheel. But you can see I'm not at all cramped in there
The Elise is a lot more difficult getting in and out, but once I was in I found I had enough headroom even with the helmet on, and leg room was fine too. In fact quite similar in room to the MX5 for me. Just getting in and out is more difficult with the lower seating position, high and wide sills, and smaller opening for doors. Pedals are noticeably offset too, but once you're driving you don't notice