What I am anout to suggest may not be the simplest road to follow, BUT it will give you the best interaction possibilities for your clients.
Once you are done modeling with sketchup, import the model in Blender. If do a search for game blender you can then implement a first person moving camera in the model. Once texturing and lighting is done (although I have no idea if texturing passes correctly from one program to the other), you choose your first viewing angle, then save an exe file that works exaclty as a first person shooter videogame. Except from the part with guns and monsters/zombies
give it a try it's easier than it sounds!
