That being said, there's a guy in central Florida with a 13b swap in his NB and it took him a solid year of week-end tinkering.
Not really correct, if it's the car I'm thinking of....
This NB from FL was used by a company (Rotary Miata - web site is dead) as the development mule for a 13b swap kit. I don't know if the kit was ever sold.
The car was under construction for about a year, but not really weekend tinkering.
It had evidently been finished right befor MATG in '04. The owner had put on a big fart-can muffler and it sounded amazing!!
I'd love to get a trashed 90 or 91, flare it and put in a 13b turbo. That would be fun!