Welcome aboard, Dave. Looks to me like you have a lot of the tools to start building stuff. Later, a planer and a jointer will prove helpful if you buy material at a real lumber yard in "rough" form. That way, you can straighten the edges, flatten the faces, and plane the thickness to your desired thickness.
But in the mean time, there are lots of things you can build using plywood. Or, if you have a Lowe's nearby, they sell project panels that come in various widths up to 24 inches wide, and lengths up to six or eight feet in length. I have used this material to build several toy boxes for the grandkids. If you have a jig saw, you can do it also with very little trouble.
Also, since you have several routers, I have the ideal project for you. It is a dual router table that has adjustable height so it can also be used as a work table or lowered to make it easy to assemble projects. The secret to the adjust-ability is a screw jack from Harbor Freight - RV model. It has a nut welded on the end. A simple drill will run the table up and down with ease. My wife has stood on it with no problems.
I will add a couple of pictures, and later search trough the forums to find my router table project.
Careful what you wish for. You end up remodeling your kitchen like we did!