Doepfer

I received my DIY kit today, and it came with a different kind of rail
than what was pictured at the Analogue Haven and Doepfer web sites, or
in the plans that came with the kit.  How am I supposed to mount them
exactly?  When looking at the end there is a longer flat piece with
holes drilled in it.  Is that the holes I would use to screw the rail
to the wooden frame that I build?  There are various T-shaped grooves,
but one on the edge of the metal is sized for the tiny nuts that came
in the bag, I'm guessing the nuts just slide around in there.  But,
how is that supposed to work?  Once the rail is screwed down into the
case, I won't be able to add nuts to the rail any more, so do I need
to split the nuts into 1/4's, and use 1/4 of them for each rail, and
insert them all before screwing down the rail?  Then all the unused
nuts would just be sliding around in the rail.  Just making sure I'm
orienting this the right way...  Also, from the surface you mount the
rail to, to the center of the screw hole...has that changed from the
old rail style to the new rail style?  If so, then the dimensions of
the case will have to be changed to accommodate the changes...  Just
curious.