Your presentation is great!!! Most of the points are scientific but It's difficult trust related on Vastu Shasta. I believe, mother nature is treating equally for all. Tree's are growing without direction, flowers are blooming with out direction, rivers are flowing with out direction, birds and animals are happily sharing loves with out directions. Only human beings are concern all problems about vastu Shasta and most of other religions doesn't trust on it, even they are living happily. Your suggestions are 100% correct to continue be good human beings but polar direction is only for matter of sunlight for humans bodies that's I believe. Your presentation will great help to society to be a good human, if people get the real facts with out fearing vastu and also spent time with nature and make clean his home.