The eCommerce Recipes were actually written for eCart 3 some time ago. However, there was quite a bit of useful information there, so we kept it available for eCart 4 users even though a great deal of it is outdated and many of the steps are no longer necessary or will not work.
We've been working on replacing the tutorials found within the eCommerce Recipes with separate tutorials, which are all listed on the eCart Support page ecart/. Any new tutorials will be added here.
As of right now we do not have a Product Options tutorial for eCart. This is a pretty complex process that also involves creating some admin pages so that the user can add the options and values to the database. The good news is, we hope to have this tutorial completed within the next week or so.