I've uploaded an updated “v2” version of this with a slot for the bit extension, and it's also around 20% thinner. The tolerances are fairly tight, so I wouldn't suggest magnets in this version, but maybe a piece of felt in the top if you want it to be silenced. 

BOM - 6x 20mm M3 screws and optional felt/foam for the top lid

This is a remix of a model that I found that had some really good features, but I just wanted to tweak a bit. This uses 6x M3 20mm screws to hold it together. Please use common sense for which face to place these parts on.

I suggest a bit of foam or felt in the top section to keep the bits quiet and to prevent them from moving around.

eSUN Bone White PLA+ is very close to the beige color of Noctua, and Overture Brown PLA is close, but not quite on.

Disclaimer: This project has no connection with LTT.