I have modified point 4 of the
mini guide above because I forgot to specify that level 4.2 is mandatory if the resize to 720p is removed from the avisynth script. For Frame Sequential 720p, levels 4.0 or 4.1 are sufficient.
I am currently testing BD3D2MK3D v0.69 beta 2, that has the new 30/60 fps option. If everything works fine, I will probably release it soon...