replacement floor panels needed

The 110 cs wagon is all but stripped, only tub and out riggers left.

There is a tiny bit of welding needed on the chassis but nothing much.

I've sourced virtually everything I need for the rebuild except:

1. The ali step down piece from the tub to the 2nd row floor
2. The ali sides for the above

Anyone know who sells them?

Also considering putting a chequered tub lining in to cover the last 20 years of bodges - any recommendations?
Rebel4x4 sell them

Just a thought - does anyone know a fabricators in n yorks who would make the above bits in chequer plate?