3018 CNC Z and X Axis Upgrade

I'm confused as to what I have to buy and what I can repurpose. Could some one tell me?

Brilliant, thanks for sharing! :-) My idea was to use v-slots and fitting wheels on the upper traverse for a very similar effect, but other than upgrading the rear traverse to a double-height profile, I haven't actually started with that yet, and your ready-to-print solution looks very attractive. Does your x carriage offer extended travel, too? I had to lengthen travel on mine because I found I couldn't mount long-ish tools properly for lack of space underneath ...