About this 3D model

Had a look for a stand to make a 2 Tier Monitor Stand but could not find a suitable design. So had a go at my own in Tinkercad! (First time I have posted a design so apologies for the crudeness!) Eventually settled on this design as it best suited what I needed. (Sorry if it has been done but couldn't find a Square Leg ) I needed the top Shelf to be removable so made a ‘coaster’ for the leg to sit in so it did not move about. It has 5 legs at 80mm and 5 at 60 mm tall. Board was 120cm/30cm/1.8cm. Grey Oak(?) 60mm legs went on lower shelf so I could slide my keyboard out of the way! The coasters went on top of the lower shelf for the top shelf and 80mm legs to locate in. If I have inadvertently remodeled something let me know