The WON reports in May 88 that Studd made a country demo tape and was trying to land a record deal!
Current episodes of John Arezzi's podcast (which are up to January 1992) are talking about Big John Studd signing with Don King to train to become a boxer. This week's episode, which I haven't listened to yet, has Studd coming on the show to talk about his alliance with Don King. I'm sure 44 year old, gimpy gorilla Big John Studd boxing would've been electric.
Big John Studd was also really good friends with Mickey Rourke from their time filming
Harley Davidson and the Marlboro Man. I remember Mickey Rourke talking about that in interviews promoting
The Wrestler. I'd read a Big John Studd biography probably.
Edit---Actually looking at the cast list for
Harley Davidson and The Marlboro Man, I feel like I've heard Giancarlo Esposito talk about hanging out with Big John Studd too. How good/bad is that movie?