There are many many photos of mandirs in photo section of Houzz. Start there. Be open and willing to take inspiration from those perhaps larger spaces to a create a mandir in a size that works for you. Make it your own and don't be afraid to experiment. Some mandirs are merely a space on a bookshelf.

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I dont think u can use this golden laminate sheet on gypsum ceiling , i m not a expert though. In the ceiling of one of the room i have used mdf sheet and used the same golden laminate to highlight the border.

Why would you not want to use glass in those tall openings? It may be the main source of light for the interior of the building during the day. Unless you really can't bear so much sunlight or you are concerned about the lack of privacy at night. In which case you can use frosted glass instead of clear upto the top of the second slab level. Above that level you will get three vertical rectangular frames. You could commission stained glass panels for those. Alternatively, below the stained glass panels you could used wooden slats with gaps in between