Thanks Slayer for the link, I have ordered some stuff from CB now from that link but another forum member has kindly offered me their Solido turret so I suspect I'll be using that as it saves me $4.
More pics. First kit finished basic painting - I still need to colour coal/wood and highlight/varnish. Actually varnish is an issue. I will not use AP on large flat surfaces as I find that is asking for trouble - anyone any suggestions what to use as a gloss protective coating ?
Undercoated tracks.

Link of said tracks

Train and bunker. I have since attached a cut down firework casing as the chimney.

Longer shot of entire train (so far...)

Rear View

Currently working on the second gun carriage. It will be tall enough to shoot along the length of the train.
Suggestions welcomed. I was going to hand paint the tracks but life is too short. Brown spray paint and and blob of boltgun along the top of the track before AP and matt varnish will be more than enough. I'm still really enjoying this build.