As promised, here are a few ideas I’ve come up with. 

The idea behind the sketches, for me, is to draw them as if they were actually for humans to drive. Obviously on the small boat model I will need a larger hull in relation to the engine, and I won’t have a chair in it. And the tank will probably have a different style of tread, but the concepts are all part of the fun.
-CORY
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These sketches remind me of the FFXI concept art. Very nice.
im kindof going for the davinci sketch look.
I can see that too.
How about a steam-powered flying machine?