I have had a preliminary look at the site you would like to replicate the functionality from and see which bits are not std. with Magento and can sort of guess at this stage how long it would take to build.
OK - so lets look at the process...
--- Scope
We need to go through the site you have provided and document all the functionality that is not std. with Magneto for your perusal, so you can advise which ones you want to keep - or forget about.
--- Design
You want to use a separate designer to create the look and feel of the site and then send that to use for slicing and writing the CSS that will control the layout and look of all content in the site.
--- Functionality
You want is to code the functionality i.e. put the nuts and bolts underneath the new template to make the site work.
----- Testing
The site will be tested on the last two versions of IE, last two versions of FF, Opera, and Chrome.
The site will also be tested against W3C validation, and W3C/CSS validation prior to handing over.
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Please check out our proposal and see what you think. Our feedback is pretty good too.
Many thanks for the chance to bid.
Kind regards,
Darren