I need a Wordpress Expert to professionally install an e-commerce plugin on my site

We have a wordpress website www.groomarts.com which requires an e-commerce plugin installed.

The site has a bespoke theme that has been developed by a webdev co. and has been very rigidly coded to enforce design issues.

This seems to create knock-on issues with the performance, features and style of any e-commerce plugins that we have attempted to install.

I have recently installed MarketPress Pro and it simply isn't working as expected, nor is any of the styling working.

So what I need is a wordpress EXPERT to install MarketPress Pro so that the plugin works perfectly as it should, is beautifully styled, has all of the features working correctly, has simple icons/menu items for users to access their account/shop/cart etc

There are a number of products already installed in the database with all the relevant images, words and pricing information, so this should allow you to get started and begin testing.

There will be no changes to the live site until I am completely satisfied that everything can be seen working on a staging area.

I have a zipped up copy of the entire site available for download upon agreeing to commence work.

I do NOT WANT:

1. Invites to rewrite the entire site.
2. ANY changes to the site design.

I should re-emphasize that the site design must be IDENTICAL upon completion.

I will need an absolute fixed price and timescale.

I must stress that payment can only be made if everything works correctly and the site design is in exactly the same state as it is.

If you can do this job perfectly and at a reasonable cost then we have further work that can be carried out.