Design a Website Mockup

We need someone to help us design relatively simple landing pages for a highly templatized e-commerce website platform that we have already created. Most of the landing pages would be for home products such as furnishings, hot tubs, remodeling work, etc. We have to build about 20 websites in the next 30-60 days. The websites are all based on an existing WordPress theme that we have already designed, coded and refined over the past year. The base website theme already has about 200 pages of highly specialized content for a major brand name in home products. Essentially the new websites we are building are made from a master website template and the job is to add more content based on other product lines and brands that the client sell. The clients in this case are dealers of high end home entertainment products. Think: pools, hot tubs, saunas, fireplaces, patio furniture, room additions, decks, grills, etc. Our goal is to make nice landing pages for the brands and categories of these other products to make them look great. What we are looking for is someone who can give us from 10 to 30 hours or so a week over the next 60 days. We have four project managers that are responsible for building these websites. We have in-house designers, coders and production people but the workload is a bit heavier than we can handle in-house at the moment so we are looking for someone who can fill in some of the gaps with producing comps for interior pages of these sites for the clients to review and approve.