Hi @PhilipVaarskov ,
webflow isnt meant for this usecase. I would recommend (if you want to use webflow) use the udesly adapter do create a wordpress template, and let your client design his own site with elementor or sth. (or you let him in to the designer → not recommended by me)
Collections are great for galleries, blogs, or content that sould show up on the page as a prestyled section. BUT your client will not have the ability to design the pages by himself.
For example, you design a sample page for a blog post and the cms data will be pushed into this layout. Or another example is, you are creating a gallerie. You are designing the layout, (column count width) borders of images and text on hover (examples).
Your client has then the ability to create new cms items, these items will show up in the predifined style, you have designed. But he will not be able to change styles.
Hope i could help