Usually start of with a red brown for the base layer. The most worn brush possible is perfekt here, try to staple the paint.
Add some orange on top, but be careful not get too much. Again a dead brush is your best friend here.
Finish it up with a heavy dry brush of silver, old faithfull Boltgun Metal in my case.
I prefer to add some more detailing once the painting is done. Foliage for bushes, turfs and stones to hold the roof in place are perfect for this.