The Mac figure goes like this: you start with a GI Joe* with poseable fingers & remove his head [ouch!], a vintage Backstreet Boys' Nike sneakers & doll head that you carve to look like Mac [I think it was a Backstreet Boys doll but I could be wrong... it's been years since I bought those dolls for my daughters.. I know the Val Kilmer doll I carved was from a Backstreet Boys doll...
that one is buried in a box in the basement somewhere]... add a Mattel Harley Davidson Ken doll's clothes [since they're somewhat baggy they hide the overly-muscled GI Joe doll physique...LOL], paint over the Harley logo on the while sleeveless shirt, print out a tiny version of the Challengers' Logo and glue that over the painted area on the shirt. Then you take a small piece of metal tubing & wind a skinny piece of duct tape around it [or just forget the tubing and make it flat like Mac did]. Cut the knife out of tin & paint it to look like a SAK & glue a tiny Victorinox logo to it...and voila... you have a Mac doll.
*The GI Joe body works the best because the arms, wrist & fingers are poseable so he can hold things & the body is multi-positional so you can position his legs/feet to imitate the way Mac would stand.