Firstly, yes my milestone is above 500 because it can not be less than 20% of the bid else i would have kept it down.
I am Computer Science student and I am fully capable of creating the site with in 5 days, it will have flexibility for the admin account to add or remove products so you may add even thousands of products. The user accounts will also be maintained as well its history. However, I had some queries regarding method of Payments you want to be in Website, if it is simply "CASH ON DELIVERY" there wont be any delay but in case Visa, Master Card etc will needed to be integrated in to the site, it might take 3-4 days longer since it is security sensitive work.
Thank you, Regards.