Thanks for for the quick response. To be entirely honest I do not necessarily like the stock lead screw situation and requiribg a bungee or other device on there to hopefully keep it straight so as to not bind. That is why I have set out to make a better Z Axis, you are correct in that I will have to address the dust collection but I would like to think that my design when finished would be as rigid as the original router design while also allowing greater flexibility in bits, movement, accessories, routers etc.
Since I have not completed my permanent sled yet I would love feedback, I posted an update picture on my other thread today talking about the Z Axis here.