However, I'd like to mention that you be careful about using the firstcadlibrary inventor files on the plastic mounting brackets. Plastic parts vary wildly, and in our instance one of the inventor parts designed by Ed Sparks had hole distances .030 different than ours.
I know that Ed prides himself in building top-notch models, so it's not because he was inaccurate, but because the distances simply aren't uniform.
Measure twice, model once, cut once.
Good luck,
Matt