The Northsider is 1/24 scale. the ladders/ steps need to be 100mm -105mm by 25mm wide, have looked at all the most popular companies graupner, robbe etc, MMM have the closest, but still not really near enough. one thing I hate making is ladders, or should I call them steps really.
All the manufactures idea of 1/24th scale is different. MMM do a set of steps that are 100mm by 16mm, may have to settle for those.
Thanks for all your answers, will keep looking.