Just to reiterate what Georges said: with the Norma it doesn't really work to try and fold the standards down onto the rail. That trick works best with the F and P Sinars where the tilt axis moves when you rise.
Also, if you go into most climbing stores (or websites) and ask for rope-carrying packs or bags, they will show/sell you something much more basic than the Vuarde packs. Dont' buy blind.
Finally, I use my 150 and 90 mm lenses on only the 15 cm rail most of the time. With the focussing track on the standards you can get another 60 mm, and if that's not quite enough a rail cap gives you another 30. I carry a 30 cm rail too, but only use it for longer lenses or closeups. If you know you are only going to use those two focal lengths you can put on the bag bellows and just take the 6" rail.