sportscraft swivel

Has anyone got experience of installing swivel bases onto the front seats in a Kombi? I appreciate there will not be as much legroom as a conversion but is it usable at all? I've got a passenger bench which I'm considering a kirivans swivel for to create a little family area on a budget. Photos...

Guys, Anyone point me in the best direction regarding purchasing swivel bases. After reading previous posts I can see most people have went with either sportscraft or Kiravan ones. Has anyone got experience or seen both in action that can recommend which ones to go for?? (I have 2 single seats...