Hello,
I'm an interior designer with close to 20 years of experience and having serviced clients in India too I have a fair understanding of the market there. Request you to review my profile here on freelancer as I will give you a brief idea of what can be delivered.
Having read through your detailed requirement the price offered is very low. In the Indian market a design proposal with all inclusive as described by you is billed at 15% of project cost (that includs build and supervision). As you require design and BOM I request you to reconsider the price offered.
I can provide you 2D cad drawings, look & feel presensation, BOQ, and drawings for services if needed. I can also forward you some contact numbers of people who can build/execute the project in Mumbai.
Request you to get in touch for taking the discussion forward.
Best ergards,
HS