The gazelle interior is already partially built up
with the rear bulkhead in place
add in the pilots seats and controls (Though I think there should be two seats)
and the dashboard
Then slid it into the fuselage, This turned out to be very difficult because when I did the test run earlier I had not taken into account the rear glazing which, with hindsight should have been fitted after the cabin assembly, Still, with a bit of perseverance and gentle persuasion I got it in place in the end.