Drawing room: the family plans its policies here, and this devta lives by justice and principle. Puja room: worship of Shiva, Adi Brahma or Adinath raises the energy. Underground tank: water cools the heat of the yogi's sadhana, as Kailash began to melt from the heat of Shiva's tapas, and Shikhi energy stored in water keeps removing about half of the house's vastu doshas and spreads energy everywhere. Conference room: convincing others with ideas and vision and setting targets.
Bedroom for elders: paint it white, not red, because red adds heat to this sensitive devta and opens its third eye. Gates of temples, schools and colleges can be at Shikhi, since Shikhi is a yogi and guru (Jupiter) and these buildings are its own home.