Well...You could try this....
Modify the config with this...fltsim.XX being your next availible number...
[fltsim.XX]
title=Captain Sim 757-200 1
sim=cs757-200
model=RR
panel=
sound=
texture=aa
kb_checklists=
kb_reference=
atc_id=N757
atc_airline=UA
atc_flight_number=757
atc_heavy=0
atc_parking_types=
ui_manufacturer=Captain Sim
ui_type=Boeing 757-200 RR
ui_variation=American Airlines
description='757-200 Captain' v.1.1\n(c) 2006 Captain Sim \nwww.captainsim.com
And then copy from "texture.nz" folder the textures...
57_RER_T.bmp
57_REL_T.bmp
Into "texture.aa" folder
Of course back everything up!...Like the .cfg...
All this does is direct it too the Rolls Royce model and change the engine textures.

Jeff