Reskin Help Please

[cvkiwi]

Hi all I had this Coal Wagon built for me by Arraial a long tome ago
and I would like to reskin this myself but I don't know where to start
so I was wondering if someone could put me on the right track please (sorry for the pun)
chris Sullivan

 

[Herlev]

Hi.
Is that a wagon you would share
I run many Kiwi trains.
herlev