Here is how I see it. And please tell me (anyone/everyone) if I am out of line here.
If a person chooses to fabricate any part for use on thier own project, as a one time deal that really shouldn't be a problem.
But, if that person takes it into production for sale to the public it had better be thier own design.
You want to make a similar product as RS for your own private use. You went to them trying to find any way you could to buy direct. It didn't work out. So because you can't afford it you're out of luck? No, you found a way to get what you want on your own.
I say more power to you.
That is exactly what this hobby is all about in my mind.