Dear Mixtile,
You should include a fanless option when selling your case since people on the web want it to be 100% silent (the included fan is quite noisy, and the overall heat dissipation system is far from optimal).
Only two corners of the heatsink need to be slightly rounded up, and 4x M2 stands should be included in the case box. That’s it! The modified case is gorgeous and 100% silent, pleasing all your customers looking for a mini desktop yet powerful SBC.