I've now added some filters & pin washes to both models. Starting with the 432 I've kept it subtle and used mostly dark colours to pop the detail. A bit of oil dot fading will be next on this.
The Rutscher washes & filters have mostly been dust coloured with a few areas such as the engine deck screens picked out with darker washes. The effect is just what I wanted & those track guards look great with the dust build up on them.