CodeIgniter Shop Development - Make GoCart multistore capable & SagePay 3D Secure

I am using GoCart which is based on CodeIgniter.
You can check GoCart out here: http://gocartdv.com/
You can also see it on github here: https://github.com/gocart/GoCart

I require two jobs doing:

- GoCart already has a SagePay Direct Module. However, it has not yet been integrated with 3D Secure. I require 3D secure to be integrated and the SagePay implementation to be checked.

- We need to make GoCart multistore capable. I have already hacked together a proof of concept of this in about 20 minutes and am confident it will not be too difficult because GoCart is relatively simple.

The functionality required is:

Ability to have 2 or more front end stores. These each have a separate template.
In the admin section you can create products and assign them to a specific store.
In the admin section be able to create a static page (ie. delivery info) and assign this to a specific store.

When the user clicks Checkout on either store they need to be forwarded to a different domain (possibly checkout.mysite.com) where they will go through the existing checkout process. The checkout pages will not need to be themed differently depending on the store.
This is to simplify PCI audits and to reduce the number of SSL certs required.


We require this work starting as soon as possible. We are looking to build an ongoing relationship with a suitable freelance developer - we have many other web based projects ongoing.

A UK based developer would be preferred but not essential given the right person.