That a door piece?
Ill have to look and see if I saved links, wanted to have some pre-ported plenums done out of the same material as the LSx intakes. Somewhere I have the info for imaging, etc . Can you use the solid works program?
Its not a cheap process but your piece will probably be much easier due to its size and simplicity..
try Brian
swiftwood@aol.com he could probably help you out.
-Ron