About this 3D model

Simple stand for TrueLife SonicBrush Compact Duo and several spare heads. I made it because these toothbrushes have a slightly different dimension than the others and my wife and I wanted something that would match the other accessories in our bathroom. Holes for the toothbrush are very precise, but holes for the replacement heads are little bigger - I found that there are differences in dimensions for heads from different batches, so I left a little margin. And there is a small hole at the bottom for draining excess water. Designed in Onshape. I think it came out nicely, but it's my very first model, so I'll be glad for comments and suggestions for improvement. ?