There's a great sale on Applejack's products, but before I buy, I'm curious how customizable are they?

A few points about me for answering the question:

1. I'm a Daz user, not a Poser user

2. I'm EXTREMELY comfortable about editing image maps

3. I'm good with the various interior Daz tools like geometry editor etc.

4. Are the "things" in them props? Images? Like the Painting museum. Can different painting be put in the frames? Can the statue be moved? Can things like chairs from the Future Recreation area be loaded and used in other seasons, or are they just bones of the main room?

5. I assume that I'll need to re-shade everything anyhow for iray, but they will otherwise work in Daz, right?