Hehe we are the same on that regard! I train in cad as often as I can so that I may be able to do some magical stuff when the router is completed ;) I have two (soon three) small children so there is almost never time!

The router will have 20mm square rail on all axis. Sad to say I couldnt afford hiwin or THK. I went for Chinese copies :)
1610 ballscrews (2 for x axis) with special end machining to be able to take htd pulleys. I ordered 1605 for z axis but got the wrong one from China. Luckily I got full refund for it :)
Will use steppers, dual for x axis.

When will you start your build? ;)