Thanks Sotongeoff for recommending freecycle.
I asked if they still had the tyres and they did.
I hadn't got anything off freecycle before so this is good to get the tyres for free, managed to get them this evening so will have to look at them in the daylight tomorrow but do feel just right.
Have to design the tyres shaping at the top and get ready to cut out.
Just a lot to be done now, to cut the tyres and struggle to turn them inside out, will have to see if they look good black colour before deciding whether to paint them.
But I think it is going to be hard grafting ahead. What do you think?