As a reminder, here are the drawings of the new combined passenger terminal and offices for Stobart Rail, from the planning documents dated January 2017:
site plan (PDF),
terminal floor plan (PDF),
links to all documents.
Access is from the new roundabout on the A689. The passenger terminal appears to be tiny: two "gates" but very little space landside or airside for more than a half full ATR. As someone with a background in construction and architecture, it's disappointing that the terminal building is not going to be much more than cheap steel shed, but I suppose it will have to start small, and hopefully be able to grow into the adjacent offices as space is needed.