Plan for my new BH

This few weeks busy with my office work & at the same time negotiating on the purchase of corner lot double storey shop office with the existing owners.  Finally conclude the sale & sale & purchase agreement signed.  Below is the sketch of the double storey shop office.

I plan to convert it to 3 storey (1st & 2nd floor as BH. Ground floor maintain as shop for rent). The design is little bit difference from my previous BH. The inter hole(LAL) open at 1st floor rather then 2nd floor which mean it go from 1st floor up to 2nd floor (go up rather then go down as most of the BH).  My initial plan as follow:

Please feel free to comments.  Will update the progress once the work comments.