Evil_Deadite
Super Freak
It would look pretty ugly seeing the neck joint. The neck is connected to the sculpt so removing the vest exposes the gap/cut where the sculpt connects to the body.
Yeah, you'd need to dremel out the neck from the head sculpt, find a replacement body with a neck and the correct body proportions which won't be easy, and then somehow transplant the harness bits onto that body as well. Other problem is the leather coat/vest underneath is too small and doesn't close in the front, so you'd have to cut it in the back and maybe sew in another piece of fabric/elastic. Also, hopefully that zipper actually works.
The real question is, where did Doc Ock get that turtle neck from? Must've been a chilly day in the Holland-verse, and Doc snatched it off one of the drivers on the bridge right before his big reveal. They should've shown a shirtless dude in the background running for his life.