The Vilna Gaon's brother's says in Ma'alos HaTorah the following:
"If today they would build a shul with an axe that was made by a Jew לשם שמים. He chops the wood לשם שמים. Everything is בקדושה וטהרה. When Jews would daven in such a shul their minds would never wonder off when they were being מתפלל."
Does anyone one know where in Ma'alos HaTorah this can be found?