This approach lets me figure out what their hourly take-home is when all is said and done.

What, precisely, is your "job title"?

Very very few can truly afford to "outsource" design. When you start adding metrics, time worked, etc. it's hubris. Your post started off OK but ended up badly.

When you use the words "take-home" in the same sentence as the word "hourly", you're violating some serious syntax.