Indeed. As they say, a picture speaks a thousand words, so you'll probably be best to use some technical plans for the engineering part of things, explaining things like the tunnel boring shield he and Marc Brunel came up with for the Thames tunnel, or the theory behind the Great Britain and Great Eastern (that drag upon the hull increases at the square of the length, whereas something else increases at the cube, hence the bigger the ship the more economical it will be), or the theory behind the atmouspheric railway and so on. And the broad gauge.
From the architectural point of view, maybe have some pictures of his achievements (Bristol station, Paddington (both architectural achievements)), the portals of Box tunnel, and so on. It would really help to illustrate any points you made by refering to pictured examples.