Ability to have add ons during checkout?

I have a client that want’s to have a list of items appear during the checkout process such a a radio button list to select a choice, a checkbox, and a few add on products in the cart… i’m guessing this isn’t possible with the built in cart… but is it possible with some custom code connecting to the ecommcerce cms? I’m not sure where to go to get help with something like this for a site I’m building… Thanks!


Yes, I want this feature too! so customers can see all the available options and how they compare to each other like this