Lambda the Ultimate

I am toying with implementing a pure type system (formally described in section 5.2 of "Lambda Calcui with Types"). I've extended the specification to include sum type introduction, formation and elimination. I've written a few examples but I'm looking for a library of example encodings in (minimal) pure type systems. In particular, I'm looking to extend the PTS as little as possible but still want to be able to translate (from a higher level language) constructs such as abstract data types and pattern matching. I read somewhere, maybe something authored by Conor McBride, that some of this is possible, but I lost that reference.
Thanks in advance,
- Anthony