Modular River Terrain Smorgasbord

I've now scratch built a total of seven river terrain boards, giving me a total length of about six feet or a variety of other smaller configurations, which I can lay out as required for specific scenarios. Apart from one board which has a gun battery built in, they are all non scale specific, so I could use them for 1/2400th scale all the way up to 1/600th scale before the river channel becomes too narrow for riverine actions. 

However, if I go on to make some regular terrain boards to use alongside the river sections, there's no reason why I couldn't use them for land based games in 6mm, 10mm or even 15mm at a push. I have a few more 1/2400th scale specific tiles to build including a bridge, a town and an opposed gun battery, but I'm thinking of making these half width boards that can slot into the existing river sections but take less time to construct and less space to store.