I think a comfortable distance between the island and the counter is around 42". It seems that you have only 30" between your cook top and the counter. I might be a little too tight. The wall between the entrance and the kitchen could be 4' long instead of 6', you would then be able to move the island a foot which would give you more room between the cook top and the island. Could you switch the location of the toilet and vanity in your dad's bathroom so your enter facing a vanity instead of a toilet which is a lot nicer.

I stay in india and the brand of blade lighting is not available here. Is there some alternative to it. Also such details is new to most and most contractors I have spoken to have expressed their inability. On my present contractor had a fair idea on how he can duplicate it though he also has never done it before. any further help and suggestions will be appreciated. If not I'll have to get the tray celing done with coves which is pretty standard and nowhere as cool as this.

quartz is a man made product using natural stone and a resin material. No sealing and is stain proof. I have had my granite for 10 years. I have never had a staining issue and set hot pots down on it seldom, but it has never bothered it. I've sealed it maybe 2-3 times over 10 years. granite really doesn't stain. So, compared to quartz, they are very similar. It all comes down to what you like the best.

acc to ur kitchen cabinet pic, I would request u to get stone ( kadapa ) vertical base frame and on top before granite fitting and then wooden panel can be done for drawers n shelves. this will eliminate wood to get wet and start to fall apart. looking forward to modular version need to know it last few years only. wherever water is concerned only wooden panels won't work for longer n steady use. for counter tables or side working space that will work but not where the sink will be placed.