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I have some boxcar sides I cast that are about 24" long, so 3 feet is probably possible. These are ambient castings though, not pressure castings. The trick is to make the pattern with shallow detail. And when you pour it, be quick! Any air bubbles on the back get filled with CA & sanded down smooth on the belt sander.
http://burlrice.com/_LS_60ftHiCube/index.php
The best advice I can give you right now is: start small & work your way up. Trying a 3' casting right off the bat would probably have frustrated me to the point of giving up.
http://burlrice.com/_LS_60ftHiCube/index.php
The best advice I can give you right now is: start small & work your way up. Trying a 3' casting right off the bat would probably have frustrated me to the point of giving up.