Storage / Space Listing Website

Hi, Thanks for taking the time to read this... I require a database driven listing site to be created, allowing for members to list their properties / parking spaces / garden allotments / garages etc for rental. A "provider" will be required to setup a profile which will then house their listings associated to them and it will be associated with both a category type (say "parking spaces") and will be associated with a location where it is available for rent. I will require an availability calender, a messaging system between providers and customers and to integrate Shopify as the e-commerce solution. I require the provider to be able to create a listing, in particular being able to categorize, enter descriptions, titles and upload images to name a few. I will be supplying the graphics so please do not quote for this, I will also be relying heavily on seo so please ensure you are able to code to drive the meta content from the database listings. Please read this quotation fully and quote according to the spec. Timescale for delivery - 4months MAX. Preferred languages / skills - Ideally built on RubyOnRails, if not then .net would be great. Obviously using MySql. Also existing use of CSS / HTML / Jquery / Ajax / Amazon S3 is preferred. Cheers Look forward to hearing from you.