stock market portfolio module

We have stock market based website. We are looking forward to adding sophisticated stock portfolio module to website. Stock portfolio can be extension of stock module and can use stockapi module of drupal. Some of the most desired capabilities that we are looking forward to are:
1) User can have more than one portfolio.
2) Portfolios can be made public and private. Public will visible to all user including anonymous users.
3) Stocks could be bought and sold. Both transactions should be editable. User should be able to short sell the stocks.
4) All the buy/sell transaction should be preserved to give idea of total profit/loss made.
5) Profit made over time, say 1 month, 3 months, 6 months, 1 year should be shown.
6) Portfolio should look attractive (sexy), with all possible colorful indicators.

All other relevant capabilities are implicitly included.

Please let me know how much it takes to develop this capabilities.