As for all the Second Life bodies, AFAIK, there are no dev kits freely available in OpenSim, especially not for picking up in-world in OSgrid or any other grid.
The dev kit for Ruth 2.0 RC#2 and RC#3 is here:
https://github.com/RuthAndRoth/Ruth2/tree/master/Mesh/Ruth...
The dev kit for Ruth2 v4 is here:
https://github.com/RuthAndRoth/Ruth2/tree/master/Mesh/Ruth...
The dev kit for Roth2 v2 is here:
https://github.com/RuthAndRoth/Roth2/tree/master/Mesh
You can also pick up some development-related stuff for Ruth2 v4 and Roth2 v2 on their official sim in OSgrid (which, unfortunately, is not listed on OSW):
hg.osgrid.org:80:RuthAndRoth
However, the dev kit for Ruth 2.0 RC#2 and RC#3 is not very good, and the dev kits for Ruth2 v4 and Roth2 v2 are even worse. That's because building dev kits in Blender for bodies that have not been made in Blender is difficult to the point of being half-useless.
New bodies as successors to Ruth2 v4 and Roth2 v2 are in the making with meshes scratch-made in Blender. But I don't expect them until well into next year.