If you want to leave a donation to help operate and sustain the Temple, there are lots of hundis (donation bins) located around the Temple. The 1st elements used were wood and terracotta, but architects gradually moved on to brick and stone, Specifically sandstone, granite, schist, and marble. No mortar https://hindutempleadelaide.business.blog/2025/02/17/exploring-the-divine-presence-of-hanuman-ji-mandir-in-australia/