I love this slide for my standing desk. Absolutely recommend it.
https://www.amazon.com/dp/B005MDWT2C/...
I used standard plywood for the surface itself then finished off the front face with custom walnut to match the desk surface.
The keyboard is a Logitech Wireless All-In-One Keyboard TK820 with Built-In Touchpad
The mouse is Evoluent VerticalMouse