I'm building an AEC Dorchester (resin kit) and would like to build the "snouted" version, as this profile:

DISCUSSION ONLY
Or in this photo:

DISCUSSION ONLY
Or this draw:

DISCUSSION ONLY
So, I ask:
What is the function of this big nose??
It seems (for me...) to be made of canvas...
Rack?
Higher capacity radiator??
Disguise??
Does anyone have pictures, draws or informations about this "big nose"??
Waiting for...and TIA !!!!