Hi dafassi, it is possible to clone from
https://github.com/JimStar/OctaneBlender.gitYou have to change server number to 6. 0 in OctaneBlender/blender/intern/octane/blender/server/server.h
to get it work with Windows/Linux server 6.0.
You can change "name": "OctaneRender Engine (v. 6.1)", too in OctaneBlender/blender/intern/octane/blender/addon/__init__.py but this is only plugin name.
I had to disable many features to get build with Cycles.
OSL, Opencollada, and much more.
I don´t see any profit from custom build but I need it because earlier version of Blender for Octane are not running on my Linux distribution.
Cheers, mib