Way to go Dave - Excellent prototyping solution, values calculated etc.
In my opinion, there are two different approaches to routing PCB's. The easiest way (without having to learn software) is create your circuit design using any drawing program such as Microsoft Powerpoint etc and then outline the result to a vector using something like Acme Trace Art. Trace Art allows the output to be saved as HPGL which can then easily be converted to GCode. The other approach is to use one of the free programs such a Eagle to draw your circuit and produce the output but the initial learning curve for this is quite steep.
You could, of course get a square breadboard, cut a hole in the centre and mount that on your mill

But seriously PCB's make the job look so much more professional and I think it is worth the learning experience.
Good luck,
Tweakie.