Genesis - adding eCommerce section to our current website

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This customer received 22 web designs from 1 designers. They chose this web design from pb as the winning design.
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http://making-light.com/products/
We would like to incorporate an eCommerce section into our current website to have a secure option for customers to purchase products from our site. We would also like to have the option to be able to set up separate accounts and have our customers log in and see all of our products with their own set of prices that are different from the main catalog. It needs to include a platform where we can edit each element/costumer account easily. Our site currently is Processwire. We're also familiar with Wordpress sites and have knowledge of Opencart. We would like your help with an innovative design and a way to incorporate all that we need into a package.
The look and feel should be somewhat similar to the current website but please feel free to propose different looks that have our brand colors.
Target Market(s)
offices, malls, businesses, sports venue
Coding
Coded - Design and coding required
Number of Pages Required
3 page
Font styles to use
Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.
Elegant
Bold
Playful
Serious
Traditional
Modern
Personable
Professional
Feminine
Masculine
Colorful
Conservative
Economical
Upmarket
Requirements
Must have
- Shopping cart and payment options, able to add/remove products price/description/etc, create and remove accounts with different set of pricing.
Nice to have
- Quick preview of the products