Also, the LS never came with a 5 or 6Speed version anywhere, not even in Japan. Getrag hasn't made one either--I checked. The only one that is close to comparison is GS300, but a custom driveshaft, electronics, and what SRK and VMF mentioned will definitely be needed.
I was quoted $8200 for Parts and Labour from a friend. So day I'll attempt it, when money permits it.