Just set up one of the rotational thingies, and it's really cool. However, I noticed that they don't appear to have any collision. I fell right through the moving parts. Is that planned, impossible, or merely a w.i.p feature that hasn't been implemented yet?

Thanks ahead of time for the cool mod, i'm loving it so far. :)

My concern here would be performance. Certainly would want to make sure this is efficient so as to not incur a big performance hit and slam FPS.

So two tiers of might work better, assuming there is a performance issue. One that retains the current aesthetic only behavior and the new one that could be more expensive crafting wise could have collisions enabled.

They are just visual.

https://youtu.be/1DTwqgKy3Fw?t=611

It could certainly be possible. I will keep this issue open for future reference.
Right now I'm not 100% familiar with consistent entity collision at an angle.

You might have a look at the older japanese mod Ugocraft:
Here's an old let's play documenting it https://www.youtube.com/watch?v=ZGYaQPIiq84
the author's website:
http://www.maocat.net/?page_id=7482
it's in Japanese, but google translate or a similar service works fine. Had similar functionality to the moving blocks you use, with collision.

Maybe adopting https://github.com/ValkyrienSkies/Valkyrien-Skies ' physics engine/systems would be worthwhile. AFAICT it could also allow building/interacting on/with moving structures.

Thanks for your suggestion, it has been added to our public submission sheet.