Maybe things like vendos and pants machines should be research options insead of game items, otherwise managing the army would take far too much micromanagement. The slig pants and wings vendos would appear on the side of the slig... barracks, enabling the production of walking and flying sligs. Maybe units that do well in battle and don't die earn veteran points and are upgraded into bouncer, popper and armoured forms?
I also quite like the idea of the squad system seen in Dawn of War. You could probably find Oddworld equivalents for all the units, heroes, vehicles and building in that game... or indeed any other RTS.
Imagine an Oddworld mod for Impossible Creatures!
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