I think you have wasted lot of space. You can have the lift in the 6 feet wide balcony at the opposite end of the stairs. You can have two ducts for utility and lighting between the houses and use the empty space and make the houses bigger. This will make the apartments bigger for slightly higher co...

If rental income is not a must, then, I would go with option 1 as the kids grow very fast and you cannot re-configure the house to suit your needs. You would need a room for each of your kids when they grow up and you need one for yourself(husband and wife). You can shift to the 2BHK in your oldage ...

You can look at the approved layout plan. The survey numbers are indicated in a dotted line. Look for the survey number on which your site is.

You have a 3 ph pump, so you need a 3 phase connection

Yes. However the joints will be very less compared to tiles.

Checking documents for a first allottee is simple. If you are not sure what to look for, consult a lawyer. He may charge a small fee but you will have peace of mind.

You can check Racold. I found them ( their tank) better than solarizer when I bought one (about 6 years ago).

There are chances that the neighbors bore well would be affected. when you dig a bore well, it is possible that the bore well digs through the aquifer your neighbor is drawing water from. when you dig deeper, and if you encounter an empty gap in the rocks, that can drain the aquifer your neighbor is...

You will anyway need a central pillar. This picture also has a central pillar. The car parking comes below the beams.

It is possible to have columns only at the ends like shown in the attachment. It might increase the cost of the structure of the building.