Re: Wedding lengha dilemma
Send all these details to your aunt and tell her to find a tailor who understands. I think it would be better if you find a home based designer rather than a kaam wala but that is your choice. If you do that, your aunt doesn't have to go looking for fabric and stuff and still supervise concentrating on your details.
If you have time, you can get a light kameez made with the same fabric, kaam on the gala and piping so that you are absolutely sure that the person making it understands your choice.
I really like your choice. :) BTW, where do you plan to get your masterpiece made?