About this 3D model

I'm working on a full engine model and will be posting each file as I go in case anybody would like any of them. Here's my model of a piston assembly, minus some small details like oil mechanisms and some registration points which I will probably adjust when I get further in the project. If something appears mechanically inaccurate please let me know so I can make the model more realistic as it's designed to be a learning tool for the mechanics of an engine.