My use case is:

There are many product variations.
Each variation has many ( ~ 15 ) custom line items.

I installed Commerce Kickstart 7.x-2.0-rc4.

I can updated view "Line items" to show custom line items in Order summary.

But after adding 15 fields, the page looks ugly.

I want to show user and admin values of all custom line items. Admin needs it to fulfill the order and user needs it to see what he ordered.

I am thinking of changing this view or add another view to show a link below Line Item and then after clicking it, show all custom item fields in an overlay.
Or,
Automatically create a new node for each new line item and add those fields there. But it will be messy to maintain later on.

But I am not sure how to achieve that. Please guide.