i have worked on some big projects though.
first proper new install job was 3 floors in a new hospital wing (inc rooftop plantroom and basement steam room)
doing work in some cat3 labs etc was interesting, first one we did the builders knew what they were doing
the second the builders were clueless and on a refurb as well
sounds interesting mate, especially the opportunity to work on a hospital. Did they offer you work after your apprenticeship