think you might be attempting the impossible mate, to take an order within the email itself you would have to display it as HTML and have some form of postback to a web server that supports at least CGI so that the collected information could then be emailed to yourself, even this is extremely crude and not very user friendly, although maybe with some Java script and such like you could jazz it up.

If I were you I would create your order form in something like excel and email it to the customer and get them to send it back