Design a Wordpress page to a website design we already have

We have a website in Quickbutik a Swedish e- commerce system with a simple and clean design that we like a lot. However this e-commerce system has some limitations that we do not like. So we want to make a Wordpress/woocommerce installation instead. But we want to keep the same simple design as before.

If you apply for the job we will send the URL so you can have a look. We also need this job to be done asap. And preferable by not buying a theme if it is not really necessary.