It will cost from 60lacs to 1 crore, map approval will not be a problem but architects do cost these days. A diploma holder will make plans for 30,000 and a good architect could cost from 1 million to 2 million even heard of a guy who charges 5 million for everything including interior decoration and all sorts of designing.
You can check with Bahria town they have a Huge design book with all sorts of plans as per bahria plot sizes.
Good Marble costs more then tiles these days, it depends from make, size, color etc.. plus when you install it and its polished some pieces have abnormal spots and lines those pieces have to be replaces... I will advise to go with tiles instead of marble but if you are fix on Marble then go with the already polished ones which do not need any ragrai(machine polish or grinding ) expensive but worth it.