Yes, this is possible. The flue channel should be packed with mineral wool insulation.

Yes it is. Whether you want to just replace one or two windows with a hup! wall or add hup! to existing walls to create a completely new look, hup! can easily cope.  You can choose between having a cill between the dwarf wall and the hup! wall and having a different wall finishes on the hup! or you can choose the full cladding option where the wall finish can run the entire height of the building for a more premium look. hup! works on both 250mm and 300m walls -the width of the existing wall must be specified at the time of order. If Building Regulations are required, you will need to bring the entire wall to 0.18 UValue. 

Cable management panels can be specified beforehand to incorporate a trunking system at 450mm height, allowing the electrician to easily run cables along the wall to the desired locations. If running up the wall, the cable should run in a flexible conduit to separate it from the EPS insulation.

Yes you can - ensure you use suitable fixings for dry wall anchoring such as Grip-it, or Bullfix heavy-duty dry wall anchor. 

hup! kits are only available for single storey extensions or free standing single story buildings.