In junior high shop class I was pretty good at drawing mechanical objects, but those were very rectangular objects.
I'm pretty sure my cat had six legs on the day I drew him or I would not have drawn him with six legs...
You want deep? I'll give you deep. This is a drawing of the camera that was used to take a picture of this drawing of the camera that I use to take pictures of these drawings..
I drew these in blue pencil thinking I would go back someday and refine them. Yup.