Drawings that may be of use at the NRM York:
Swindon Roll 457
SL/SW/2209 Window Apertures (Cab front and side window frame sizes, modified as per build)
SL/SW/2543 2700HP Diesel Hydraulic Locomotive (Original weight diagram, might be nice box art..)
SL/SW/2451 Livery & Spacing Diagram - BR Blue (I get the feeling this drawing wiped out the maroon spec though it does still have the modifications including 27-9-62 "colour of body changed from coach maroon to loco maroon" )
SL/SW/2619 Arrgt. & Details of Engine Room Windows
SL/SW/2872 Livery & Spacing Diagram - Desert Sand - D1000
SL/SW/3128 Livery & Spacing Diagram - Locomotive Green - D1002-D1004, D1035-D1038
The following 4 drawings are fascinating as they show the body framework without the skin on much like a wooden aircraft without the fabric covering!
SL/SW/2669 Arrangement Of Welded Pads on Upper Frame 'A' End Outer Section
SL/SW/2670 Arrangement Of Welded Pads on Upper Frame 'A' End Inner Section
SL/SW/2671 Arrangement Of Welded Pads on Upper Frame 'B' End Inner Section
SL/SW/2672 Arrangement Of Welded Pads on Upper Frame 'B' End Outer Section
Talking of weight diagrams looking nice on a box
Swindon Roll 365
57-401A BTC 1000HP DH Locomotive NBL Glasgow
56-654F BR 2000HP DH Locomotive NBL Glasgow