🚀 go-pugleaf

I am a new Unidraw/InterViews user, and I am trying to build a graphical
editor (obviously).  I am having a lot of trouble understanding what is
going on--partly because I am using InterViews 3.1beta, and Unidraw seems
to still depend on InterViews 2.6 backward-compatibility.  A few of my
(hopefully easy) questions:

(1)  Can I use the 3d InterViews WidgetSet with Unidraw?

(2)  (Most important)  I am trying to define new Components for my editor.
John Vlissides' thesis states that the easiest way to do this is to 
compose existing Components.  Sounds great to me, but I can't find any
examples in the distributed applications where this is done.  All components
seem to be atomic.  Could someone please point out a composed Component
in one of the distributed tools (idraw, ibuild, etc), or send me a simple
example?

(3)  I fetched schem from interviews.stanford.edu, but I am having trouble
compiling it.  Has anyone compiled this with 3.1b?

(4) Is there a tutorial somewhere on creating new Components for Unidraw
editors?

Any help would be greatfully appreciated.

Sanjay Mehta.