TLAR, remember the best line in the movie "The Karate Kid" where the old Japanese guy (Pat Morita) says to the young street kid (Ralph Macchio) "I promise teach Karate... you promise learn."
When you do get a proper real live engineer to run your numbers and help you design something, understand that there is a reason for whatever they are telling you. If it is not what you are hoping to hear, don't get angry at the engineer because you were hoping for another answer.