Interspire modification - repost

We require modification to our interspire shopping cart (version 5.5.4): 1. requirement for minimum order to be met before order will be accepted. Minimum order value should be able to be adjusted in admin panel. 2. a button in the store for customers to click "Notify Me" when an item is restocked that currently shows as out of [login to view URL] then receives automatic email once item is restocked. A report for admin to detail a summary of stock items customers have clicked to be notified about that are currently out of stock. 3. a pop up message that will notify customers who are attempting to order more than the available quantity. Eg. if we have 1 item left and a customer attempts to order 2, a message should pop up to say "only 1 in stock". Currently customers can adjust stock on 2 different pages (main shopping category & shopping cart summary) so message will need to appear in both formats. If customer attempts to order more than available on multiple items, a message should let them know which item/s do not have the available qty. You will be given access to a test shopping cart in order to create the necessary code. We will then require the code and instructions to be provided to us to place on our working website. We do not wish to provide access to our live site for this work.