Pyroalchi wrote:1.: is the mounting of the "turret" weapon designed in a way that the Battlecannon/twin Lascannon is a separate piece (that could thus easily be changed in between)? And if not: would it be very difficult to cut the weapon free?
Looking at the build instructions, via the reddit, it looks like the turret and gun assembly are the same, a turret with the gun attached to a cylinder that goes into the turret "socket".
Pyroalchi wrote:2.: does the Malcador Battletank also contain a part for a Hull Demolisher cannon, as the Annihilator and Defender seem to?
Doesnt look like it. The Annihilator and Defender come with a 2 piece hull battle cannon (mount and barrel), whilst the Battle Cannon comes with a different mount and 3 smaller guns, looks like heavy bolter, las-cannon and, based off the rules, an autocannon.
Sadly, the instructions that were posted seem very short, but that doesnt surprise me,
FW vehicles seem to be very "its obvious, you figure it out".