Preview result

[Yuripetusko]

Is your feature request related to a problem? Please describe.
There are 2 types of previews that I can think of. Both are useful in their own way.

1. Ability to pick 1 part for each zIndex and preview
2. Like 1 but also ability to upload some dummy items to see how it fits together (rmrk 2d composer can be used here for example or nft-renderer)

Describe the solution you'd like

Describe alternatives you've considered

Additional context