Ecommerce for several sales stores

We have 3 kind of stores.
Shoes store
Cloth store
Hardware store
books store

What we need:
Use Open Source eCommerce website Magento.
Be able to sale via Smartphones and Tablets.
Be able to use several payment vias.
A functionality like this eCommerce sites (note exactly as they are):
for Shoes:  www.netshoes.com.mx
for Cloths: www.jollychic.com or www.amazon.com
for hardware: www.acehardware.com  www.hardwarestore.com
for booksstore: www.amazon.com
high performance, zero concurrency trouble, high avaliability
we will provide real data

what we should receive:
source code of every single part of the project,

what we both know:
you won't write from zero the code
you will reuse source code
you will use templates to acheive the business activity
as you're an expertise in magento ce will be easy to do it


what you should prove:
you have the skills to give us a good ecommerce site.
You know perfectly MySQL data access (we must view that in an example)
You know perfectly the use of Entity Framework like the one used on Magento
You have made several sites using Magento CE