manz - you nailed it!

My experience so far has been building and slicing solids.

As far as constructing surfaces, it looks like you:

Selected 3 curves at a time. Joined two of them.
Swept the resulting two rails with a straight line profile.
Repeated the above for the remaining two surfaces.
Joined the three surfaces.
Fillet the center edges.

Is that the process?

Thanks again. A great learning experience.

Ed