After fumbling around, I discovered how to embed iframes, which gives me the opportunity to carry my page header and menu over to some of the external resources. I hope to get everything under the same look and navigation umbrella, but I’ll just have to experiment to see how it works. I’m using the iframe plugin currently, and it looks like there are a half-dozen or so different ways to do this.
In spite of the learning curve, I’m pleased at how this site re-engineer job is coming. I had been dreading this for a couple of years now.