Hello Parisa,
I had both steering wheels. The walnut wheel felt just right in my (tall) hands, the riveted one is too thin for me. It seems to depend a lot on how huge your hands are (and what you like). I liked the walnut wheel so much that I keep it as a spare.
Jay, take into account that the Plus4SS Banjo steering wheel (which I like very much) is bigger in diameter to cope the 3 turn steering rack, if diameter should be an issue for you.
Parisa, do you want to go for an easy up roof or is a trad. 9 stud an alternative for you (no mohair option so far I know). I like the look of a 9 stud much more, and after my experience with three easy ups, it´s nothing to worry about to manage a 9 stud hood - a three minute job up and a one minute job down, and it keeps you also relatively dry in the rain. And a really BIG advantage are the two additional corner windows especially for checking bicycles when cornering as well as for blind angle cars. On the MMC page you can compare the look of both roofs with the car configurator.
Oh, I forgot to say, welcome (from a driver who also shares this curious mix of an Elise with a trad Mog).
Heinz
