The AT is not a very usable format. I have no clear way to modify it, and it is awkward relating it back to the DP which often generated it.

Also it is not strictly necessary. Posting a DP could go straight to an Assembly. Is it worth keeping?

It has some useful information, essentially telling the user what assemblies can be created, and what the piece parts are, but on the whole I don't think it pulls its weight, in its current guise.