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Can troops on top of a bastion assault a unit inside of the bastion.

Yes, see multipart buildings and assaults

How does that work with the ruling on the FAQ.

Q. If so, do battlements count as a separate building, or is the
bastion a multi-part building? (p95)
A: Battlements are treated as being separate from the
building itself, simply acting as cover for any models on top
of the building in question – see the rules for battlements on
page 95.

I tend to ignore that FAQ, as it creates an insane mess

Can a FMC land on the top of the Bastion ?

Yes, same as JI can do.

If you treat the Bastion as a multi part building, then only Infantry can be on top? And the follow up, can the FMC assault the unit in the building if he is allowed to land ?