Robert, not too bad. To get rid of the materials, open the Materials browser. Go to the In Model library (drop down menu), right click on each texture and choose Delete.
Not to nit pick but, set precision to 1/64" and uncheck Enable length snapping. This will help you get the components aligned properly. Also while you're in Window>Model Info, go to components and get rid of the check mark for hiding components. when the model disappears while you're editing a component, it's hard to edit that component relative to the other stuff.
Finally, go to Styles and hit the Edit tab. Click on the wireframe cube and change line color to By Axis. Note the black lines. The diagonal bracing should have black lines as should the circles. All the rest of the components should have edges in red, green and blue. Not that the back and the bottom front rail don't have any red lines. This indicates these components aren't square to the rest.
Keep plugging away.
By the way, did you intend to send back the boiler model or do you want me to edit the one I have?
Irony: The opposite of Wrinkly