Another idea I have had based on this French Golden Demon entry.
The idea is a brown water riverine force. Lots of landing craft, small patrol boats and monitors.
Ork Landing Craft from my website.
Ork Riverine Monitors from my website (work in progress).
In case anyone doesn’t know what I am talking about, here is an excellent web article on Vietnam War Riverine Craft.
The best chapter, as in the one with the most pics is chapter two.