Even so making a mod is legal. Its done for many games including Half-Life one of my favorite games to mod for. I do 3D lvl design for it.... working on my own mod Id like to release in stores some day. They even got mod conventions in California.
You should be able to use cad to build the level structure and somehow incorperate it with code to make the lvl active in the client. Sorta like plug-ins.
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My mother always said I was EvIl.
EvIl-QuEsT
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