Malcolm models the South Australian Railways in N scale and uses 3D modelling to produce models. In the past some of the models were used as masters and released as kits by Aust-N-Rail and Peter Boorman's Workshop. Now that Peter has retired from the N Scale casting scene, many of the models were made available from Shapeways under Malky's N Scale Models at the Shapeways shop: https://www.shapeways.com/shops/malky-s-n-scale-models
Some of the models have now also been made available from alternative sources:
Rob Carpenter's Aust-N-Rail: Aust-N-Rail - HCA cement hopper, 8300 brakevan
and Geoff Biggs' Dogspike N Scale Models: Dogspike N Scale Trains - Redhens, Jumbos, Superchook, Steel cars
These two suppliers use resin printers which can produce a very good surface finish, as well as finer details than previously possible. Their versions of the kits will include some added details such as handrails, steps and similar which previously had to be etched brass. The Shapeways option will remain open for the foreseeable future.
Instruction sheets for these models are available here:
Redhen 300 class instructions Redhen 400 class instructions
Redhen 860 class trailer instructions 500/600 class Steel Car Instructions
Baby Health Car instructions Poison Train Instructions
W wagon instructions SHBX Grain Hopper Instructions
HCA Cement Hopper Instructions D Mail Van Instructions
Sf Sheepvan Instructions S Bogie Sheepvan Instructions
Joint Stock Sleeper Instructions Joint Stock CE Van Instructions
Joint Stock D Mail Van Instructions Sleeper Finnis Instructions
Early Series 8300 Instructions JCP Instructions
VR X Class instructions Brill 75 Railcar and Trailer Instructions 3D printed Version
SAR Ballast Plough Instructions SAR Z Ballast Hopper Instructions
Superchook 2300 Instructions Superchook 2500 Trailer Instructions
CGP/AVBY Instructions Bluebird TM-12R Chassis Adapter Instructions
2000 Jumbo Instructions 2100 Jumbo Trailer Instructions
2000 Jumbo Chassis Modification Instructions Brill 55 Railcar Instructions 3D printed version
HO Scale Model Instructions
HO Scale Water Column Instructions
Decals and Custom Etched Brass Parts
Decals and, where applicable, custom etched brass parts are available to complete these models, as well as some extra decals for Peter Boorman's Workshop kits.
A listing is available here: Decal and Etched Parts List