Hi Nick,

Welcome to the forum don't get hung up on views and no replies...it's hard to give a meaningful reply without knowing a bit more so most people will shy away from giving advice. It's a bit like saying I've a room to paint, how much paint do I need? Have you got a cad drawing of your router we can look at? What are you aiming to cut, how long is your Z axis etc. etc. etc. The strength/thickness needed will depend a lot on your design and what you're looking to cut, give us some more to go on and we'll help you out.