Hi Rob
That sounds like a good idea, it can be a bit crumbly when you're trying to cut it to fit.
But because it's so light, but quite rigid you can cut and lay really quickly (although I'm having a rest tonight and compiling my shopping list for the Leamington show at Stoneleigh tomorrow -
Woodland ballast, one of those ballast spreaders, some sections of retaining wall, maybe a few s/h coaches or another diseasel

....................................
I still havn't decided the best, way to fix this underlay to my baseboards - D/S tape, impact adhesive, panel pins,
any suggestions ?
Rgds
Richard