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Congratulations! Moldmaking and casting is about as fun as it gets--let's see some photos! I didn't quite understand what you were casting and what you were building from Legos--pictures, my friend!
 

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Yet another source I've used is Smooth-On. You can order directly from their site (www.smooth-on.com), although I'm not sure that's the least-expensive way to go. I found this to be a fairly-expensive process, but I also think it's about the only way to practically do some things. I wanted custom doors for boxcars and the plan was to build about 20 cars...so 40 boxcar ends. Casting looked like the only reasonable way to do that.

I was impressed with the detail that can be reproduced (both desired and unwanted) with the process. The technique forces you to really pay attention when making the patterns, since it highlights every tiny imperfection.
 
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