The SiCK-60 could really use a companion. This little numpad should be the perfect addition to your 60% keyboard. Built to be handwired with a Teensy 2.0 and costar 2u stabilizers.
For more information on this keyboard along with full DIY and parts breakdown please visit the SiCK-68 page here: https://www.thingiverse.com/thing:3478494
You can find the SiCK-60 case here: https://www.thingiverse.com/thing:3671408
The filaments I used are from Inland and can be typically ordered for $15 to $17 on Amazon.
Inland Purple: https://amzn.to/31wsUNe
Inland Yellow: https://amzn.to/2F8uVWp
Enjoy and post your makes!
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