I really like the simplicity of Belrius's original design, but thought it would be nice to control the open and close mechanism by extending a slide out through the face plate. The STL has the objects required for one face. You can easily print this out twice to replace both.
Additionally, you might want to make the knob slightly larger in diameter so that it covers the entire slide opening. I didn't do that for this one, but it's an easy change.
Nothing special here... just set it up to print and hope for the best :D
You can see in my images where I added on a little plate to the button. Purely decorative, but I think it gives it a little something.
Really, I just measured the amount of movement the original design had (22mm of vertical travel). I removed the branding from one of the existing faceplates, and knocked a hole in the side of it that's 8mm wide and 22mm tall. Then, I put a 6mm hole into the racklift centered at its lowest resting point.
The button has a 6mm plug that slides nicely into the hole.