Is a Sandman still a Sandman if it's tags are gone???

Yep, if it was a Sandman it is still a Sandman without the tags. It may be harder to prove that's all. E.G. I buy a Sandman brand new, have all the purchase documentation photos of my pride and joy, etc then someone steals the car and it is recovered minus the tags. It is still a Sandman, but not worth as much. Even the insurance company will pay out some of the value based on the fact that is harder to prove it is genuine and therefore not worth as much to others. I know I would not buy a legit Sandman without the tags even if I could say yes it is still a Sandman.

Is a Sandman still a Sandman if the chassis doesn't match???

Yes...As above. It has just got a new or second hand replacement part. Still would not buy it. Well Maybe :Chin:

Is a Sandman still a Sandman if it has had a body swap???

Uncommitted. If it retains its tags and chassis numbers and they all match.. But to do this the tags must have first been removed from the previous body. Actually I don't know about this one. If just the tags were swapped and every other part was from the donor vehicle I would say no. Not sure I have a definite answer on this one. I know I would feel duped if I bought a car only to find out the tags did not belong to it.