I wish I had consulted one when my kitchen was being designed. I think additional storage options could have been explored that I simply didn't consider at the time.

there have been many different floor plan programs recommended before on HOUZZ but you need to understand what you want and how much space is needed (always include scale sized furniture in your plans) before you can make any program work best..if you post a rough hand drawn sketch of your ideal house on a site plan showing the dimensions of your proposed rooms, the width and length of your block, directions of north and any special features including a wish list of what you would like to include i'd be happy to make a rough plan for you and there are numerous other HOUZZERS who will offer excellent advice

I'm assuming a Pooja room is a prayer room?? You have an extraordinary large home, unless the rooms are very small, for two people. So there should be room in another part of the house to place the Pooja room. Keep original plan as is. with living to the front. You have to try and get some northern sun into your home. But, do you really need three living areas, plus a study plus 4 or 5 bedrooms, for two people?

Once the tiles are all stripped out, lay a sub floor over your concrete slab to even out the floors. Otherwise, there will be tripping hazards, or aesthetically undesirable transition strips. Or the other way, reduce the height of the higher floor.