OSC to CRE migration and Free shipping based on Zip code

I currently have an old OSCommerce site, i want to migrate all the data as well as custom mods over to CRE Loaded ([login to view URL]). I want to preserve the basic color and theme which i currently have and preserve all the products, images, prices, etc. Additionally, on OsCommerce there were some modifications we made, one being a Free Shipping by zip code. Such that when the customer checks out they will have all the normal shipping options, however the option for Free shipping is available only in the zip codes specified. So we need this migrated over as well. At the time this shipping solution was created from scratch but i did find the following which i believe might be a better solution, however i am not sure this works on CRE. [login to view URL] Often people apply without reading, so please message me with 37287d as the code so that i know you read everything.