I don't no where you live? But if you have a University nearby see if they have a school of Architecter. If so go talk to a professor who teaches it. He might design for free as a class project for his students. Had a friend who did that it turn out First rate.
spiderman I forgot to say...If your not making any exterior changes to your loft you might also see if there is a school of interior design around you. If there is just go in a talk with a professor if your nice they will assist you no problem.
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