Clasisifeds scripts design tweaking

Hello, I have purchased a fullt functional open source php script wkith full 100% decrypted source code and I need to make some additions: 1) add a contact us form in the script for listings 2) beautify the front end of the script with a professional interface...templates have css modification capability.I will let you know the kind of template design. Please quote final quote and exact timeframe..no hourly rates and further PM requests will be entertained..final fixed project bid gets chosen. Kindly provide ACTIVE links to current work...and not thumbnails/ non existing site links Thanks, I have many more projects If you can get this right for me.