Nothing makes God happy than building a good place of worship for Him. God deserves the best. Let those who think the money should be redirected to something else go and tell Him that He( God) does not deserve a beautiful place of worship.
i also think that judas iscariot brought similar suggestion when a woman in bible brought some expensives perfume and poured them on jesus feet,for judas he saw it as a waste of money anyway that is people's opinion for me our God deserve the best from us in anything.