Hi Mike,

Seems like a good approach.  The alternatives (large team of talented 
artists creating pre-drawn graphics or realtime rendering of detailed 
models) are virtually out of reach for a starting indie.

I've dabbled with the same approach for a space game.  I like the 
results so far.

Watch out for too much use of reflection, lighting and shadow.  The 
elements can look fine on individual units.  The problem is when you put 
them next to each other and the effects don't match or interact 
properly.  Example the shandw on your crane truck unit.  If it falls 
partly off the tile then you have an issue.

You get combinatorial explosion if you try to produce each unit in each 
orientation with each combination of several effects at each scale etc.

In a way the higher quality of rendered images means you have to pay 
close attention to the little stuff.

Good luck.

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