Hello Jamie,
I happened to talk to Richard, of The Train Shop at Morecambe, about your project. He suggested that you contact the Museum at Lancaster. Aparently they have quite a lot of info about the Green Ayre line. Maybe they could assist you?
I'm R/D tomorrow and going into the city centre so I'll pop in to the Museum and see if they can help. I'll let you know how I get on.
Rob