When you do some scenery like grass and what not. Static grass shows up really well though 2mm and 4mm will bring your models out far more then the foam. I have been working slowly on a few modulus for my narrow gauge extravaganza. The only one thats done is a section depicting belgrave trestle from australia. very nice work on your engines I have a puffing billy garratt that i have yet to find the chassies for.
If you guys are looking for some more models not from parkside look at 3d printing like shapewaves. I have 5 models from them a diesel conversion for the MDT, the G-42, welsh highland 2100 glaslyn, 20' reffer,and a 20' pulp wood flat. My railway runs anything hon30 narrow gauge for more rolling stock verity. I'll add photos and videos later and will keep linked up with more info.