Freikorps Armoured Trains

The extra Peter Pig figures for the Red Actions! project arrived in the post, so I'm now just waiting for my QRF order to turn up before I can get started. The only thing I haven't got is an armoured train, a small number of which were used by the Freikorps in Latvia in 1919, either captured from the Reds or improvised by the Latvians. I have some old Triang TT gauge flat wagons and well wagons than I'm thinking of using for this, adding a superstructure and turrets or perhaps even a naval gun mounting, the guns being supplied by the Royal Navy!