Summary section that shows all selected answers in multiple list boxes and text field

I have a form that contains different categories, subcategories and a summary section.

Per item, users must choose 1 from 3 radio buttons (A,R & N/A), and select an option in a list box. Users can select multiple items in the list box if they need to.

The form looks like this.

I want the Summary box to contain the category name, sub category name, selected radio button option, selected items and the general comments section.

I know the script on how to populate a textbox with the selected items in a list box, but that's just for one item only and not multiple list boxes.

Here's how I want the summery box to look like based on the selected items in the image..

     Building

     Item 1 - A

     Detailed Item List: B, C, D

     Item 2 - R

     Detailed Item List: 3, 4

     Item 3 - R

     Detailed Item List: 9

     Mechanical

     Item 1 - N/A

     Detailed Item List: W, E

     Item 2 - A

     Detailed Item List: A1, A2

     Item 3 - R

     Detailed Item List: B2, B3

     Plumbing

     Item 1 - A

     Detailed Item List: C1, C2

     Item 2 - R

     Detailed Item List: D1

     Item 3 - N/A

     Detailed Item List: P

     General Comments

     Sample text.

I'm not sure if this is the easiest way to do this, to use list boxes. Or check boxes is the way to go. I can add all the items and just put check boxes beside every option.

Any suggestions on how to make this happen?

Thank you in advance.