Magento apptha few changes

this is project is to make it very simple to add products, we need to add colour n size selection on same page easily selectable, we want to remove confusion of adding products n make it easier, we need magento expert whos got experience working on multi vendor software Apptha, Shipping 1) To give options to sellers to select national or international shipping. Eg: If the sellers selects ship nationally only say India, It should be visible on front end to all customers that the product can be shipped only within India. 2) To be able to set shipping cost for national and international shipping. Eg If a seller selects to ship products both nationally and internationally they should be able to add costs respectively. ( apptha has this option) 3) To be able to select multiple countries for shipping set cost for them. Eg ship only to UK USA Canada ) 4) If a buyer selects to buy from different countries all shipping costs are calculated at the time of checkout. Eg: buyers selects a product from India another from China their respective costs are implied at check out. 5) If a buyer selects a product which is limited for national shipping from an international country they should receive a warning while checking out. Eg a product that is set to ship only within India, it will show a warning that the product can be shipped only within India 6) Create color and size swatches. To be able to set color and size on all products with their respective quantities. Eg Color red size M Quantity (10) This is available in apptha 1.5 as configurable products but only shows as drop down lists. we want it so its tick box selection, please see below link for reference 7) need to speed the site up by adding full page cachce n other adjustments 8) we have currency convertor which let seller upload products in there local currency, its not working for bulk upload, we need this fixed as part of the project, 9) we want to add flags so if the product only available in India it would show Indian flag on front end, if its global then it would show globe, after all is done need to check code to make sure its all working correctly [login to view URL]