Had the above question from a reader and thought I would share here as well in case anyone else is looking for a similar answer.
As far as niche engineering site I did a quick search and here are some that may be worth a look if you have not tried them already:
And here is a good site with 50 more:
Hope that helps and best of luck with your search!
315 Madison Avenue, 24th Floor
New York, NY 10017
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