Re pathfinding (actually more pathfollowing), there is https://github.com/opensimworld/active-npcs -- as I recall, it's pretty complex, possibly better suited to a scripter, and I haven't used it lately. It seems a while since it got an update on GitHub. There is, however, a hypergrid source cited t...

Something on mesh limits which may (or may not) be relevant -- the ~21.5 K tri limit seems to have been a bug in the importer http://wiki.secondlife.com/wiki/Limits#Mesh

If that's no good, another option may be to slice the mesh into smaller sub-meshes, import them separately and then reconstitute a linkset.

Not a mesh expert but I normally think of 21.5K tris as the upper limit.

It has been a while since I did any particle scripting but I believe the issue is that a prim can be the target of multiple particle streams but the origin of only one. I don't know anything about operation of the harp but one solution for the particles would be to have a linkset of 9 emitter prims ...

Don't script much these days but something like this might work -- change the float values to suit (the first one is the time taken for rotation, the second is the delay between rotations). NB modified from continuous script example at http://wiki.secondlife.com/wiki/LlSetKeyframedMotion. default { ...

Lovely build and great to see you back.

Freely available in wav format for personal, research and educational use http://bbcsfx.acropolis.org.uk/ -- the wav format seems fine for Kitely though many of the effects need editing for duration.

Like this? //Simple remote light by Adelle Fitzgerald. Use as you like but please keep this header. integer channel = 20; //Set this to the same channel as your switch. If you want to operate more than one light individually then set to a diffetent channel (not 0) and set the same channel in the swi...

Austin Tate has an early 2018 blog on Ruth/Roth mesh bodies https://blog.inf.ed.ac.uk/atate/2018/01/21/ruth-2-0/