I think 2 players at the Bitter Ender will tackle this CG. These are really good questions that I'd like to know an answer for too.
I don't see how moving a gun out of a fortified location would be allowed but we'll see what the designers say. I think there would have to be an exception for the British 94* ART which can be dissembled in this CG.
I would tend to agree. But an argument could be made that the Germans only have access to the 75* Inf Guns and they are easier to move around than the type of guns that are available in other CG's. Here is how the CG17 rule is written compared to other rules about Guns in Campaign games:
OPERATION TURNSCREW
CG17. GUNS: Each non-vehicular Gun that ended the last CG scenario on-map must be set up within three hexes of the Location in which it ended that scenario [EXC: 81mm MTR, 94mm ART; Escape (5.506-.5061); Shift (5.513); if at the start of setup (RePh 5.5232) it is hooked up to a Mobile vehicle; if a CG Idle Date has been generated since the last scenario; instead, it may set up anywhere in its current Setup Area], regardless of whether it will be set up (un)hooked. Each SW/Gun in a Setup Area that contains Personnel may be set
FESTUNG BUDAPEST
CG4. GUN/AFV: A Gun/AFV set up in a Fortified Building Location may never be moved during the course of that CG. Such a Gun/AFV, once revealed, may never again set up hidden, but may be set up Concealed if able to. Otherwise, Guns eligible per A12.34 may freely set up hidden in CG scenarios.
RED BARRICADES
CG5 GUNS: No Bore Sighting is allowed. A Gun/AFV set up in a Pillbox or Fortified Building Location may never be moved during the course of that CG
[EXC: if Eliminated]. Such an AFV/Gun, once revealed, may never again set up but may be set up Concealed if able to. Otherwise, Guns may always set up hidden in CG scenarios.
A BRIDGE TOO FAR
CG5 GUNS: A Gun set up in a Pillbox or Fortified Building Location may never be moved during the course of that CG
[EXC: if dm/Eliminated]. Such a Gun, once revealed, may never again set up hidden, but may be set up concealed. Otherwise, provided it sets up within a Friendly Setup Area, an Emplaced Gun (only) may set up hidden (at no cost in FPP) in CG Scenarios. Each non-vehicular Gun that ended the last CG scenario on-map must set up within three hexes of the Location in which it ended that scenario
VALOR OF THE GUARDS
CG5: GUNS: Bore Sighting is NA for all weapons. A Gun/AFV in a Pillbox or Fortified Building Location may never be moved during the course of that CG
[EXC: if Eliminated]. Such an AFV/Gun, once revealed, may never again set up hidden normally but may be set up Concealed if able to. Otherwise, Guns may always set up hidden normally in CG scenarios.