Gasherd 3D-Modell

I'm new to 3D modeling and blender, so the meshes and materials aren't very good, specially the glass material. I just couldn't make it look like glass.
The model isn't rigged, but almost everything is a separate object and you can transform them, like open the door and turn the gas volume controls, etc.
I would like to read your comments about the major problems you spotted in the model or any ideas and solutions you may have, in order to improve my work. I wouldn't be very active in comments myself though, so sorry about that and thank you all in advance.
By the way, you can use this model in any kind of project you have.