Yes , I did do the Miata!
I did the Skip Barber 3 day racing school in the Formula car. But I don't fit in it, so when I went back for the two day advanced school I did the MX-5 Pro Cup (Miatas). Was a blast! I like the MX-5 Cup cars because no hardtop, myself and another guy that is 6'7" shared the big boy car. We just climbed in out the top, we never used the door.