Sandringham Six

Ok here is a long shot ! Does anybody know where I could get hold of a replacement chassis for a Sandringham Six . Nobody surprisingly seems to list one LOL. Would need to be the 125inch version for a rebuild project I was looking at. I think I may end up looking for a complete vehicle at this rate if its cheap enough as one supplier suggested around £4k for the chassis alone

Any help would be gratefully received !

cheers
Paul