Customization to osclass plugins car and real estate attributes

Hello, i use osclass 3.2 with tuffclassified theme ([login to view URL]) Freelancer must have experience with osclass and its code i need customization to car attributes plugin (or write a new plugin) specifically i want to add more details to car attributes and more details to search. eg. someone post an ad and sells a car that has 15.000 kilometres he puts 15000 in the field "kilomtetres" then people are able to search with drop down like this : 10-15.000kms ( this would show this ad with 15.000kilomtetres or if user chose 0 - 10.000kms dropdown (this would show all cars that have 0 - 10.000kms) and so on. And more drop downs like this eg. for engine cc someone is able to search 1000cc to 1500cc etc.... a perfect example for search: [login to view URL] make same plugin for motorcycles search or modify the current car plugin also if you are able to make the plugin so i can create my own custom fields inside it would be ++ same for real estate plugin. i am able to give max 50 euro for this (66$) lowest bidders will be chosen