Lego Pen Cup

This pen cup that I created easily allows you to build onto it with LEGO bricks. With my recent work with modeling LEGO and pen cups, I thought it would be a good idea to combine these two ideas. It should be possible to stick the pen cup onto a LEGO plate, as I made holes on the bottom. The dimensions should be 104 x 104 x 65 mm. If you have any suggestions, let me know!
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At the moment, I don't have access to a 3D printer (I will have access soon, hopefully!), so it would be greatly appr