ameijers:

If your DH has a decent table saw or radial arm, and knows how to use
a tape measure and a square, shelves like this are one of the easiest
thing for a DIY to build.

I think you are underestimating the project. I suspect the cabinetmaker
was quoting something along the lines of this:
http://www.blackrockcabinetmakers.com/built-ins.htm
except painted instead of varnished.

The units would be built of cabinet grade plywood and trimmed in solid
wood. This is not a project for the casual DIY, although it is perfectly
reasonable for someone to do it themselves.

--
Mac Cool