Jody
At 1/200 scale, am I correct in thinking the chute will only be about 2 cm in diameter, if that ???

How about making your master of the shape in something like sanded wood dowel or Femo on a stick that can be formed with a craft knife !!!!!!!!!! Once you have your shape including all those bulged pleats, try a basic push through type of vacforming on clear plastic.
In 1/200, it will be hard to form your pleats with tissue and keep the shape as you try to peel it off your former.
At least with the vacform method, you should be able to withdraw your wooden dowel or Femo former leaving your clear plastic shape ready for painting including clear areas left to mimic the vents in the chute that could be drilled out if you wanted to be really clever.
Good luck
Nige