Build an Estimator & Custom Invoice in Magento

MAGENTO ESTIMATOR & INVOICE We want to build an estimator in Magento for our ecommerce website. All products are uploaded and ready. All that needs to be done is fetch the attribute and create an estimator. Below is the requirement. Please read the complete requirement carefully before bidding. Only bid if you are 100% sure Fetch product attributes from Magento database and create an Estimator Estimator should show the inventory Estimator should calculate the area by multiplying length & Width Estimator should be able to calculate total price by multiplying area with per sqft price Unit price would be fetched from DB Estimator should total up the price by adding the price of each item. Estimator should have the provision to enter the transportation charge Tax calculation should be done on the estimator based on tax slab Tax slab will be fetched from DB for the product Should be able to convert estimator to invoice in one click Estimator design will be provided by us Invoice design will be provided by us