I highly doubt the LD would make more than 100hp with modest boost and correct fuel enrichment. For a diesel it isnt doesnt get terribly good milage either. Ive also read bio-diesel has roughly 12% less energy than dino-diesel, so you would be fighting that loss as well. The LD also uses a cast iron head and beefier internals so it is heavier, especially if you hang a turbo off the side.
I dont have the time to read that site right now, but those are just some things to think about.
There is a guy here in seattle that has a 5spd LD28 car for sale, and a automatic one as well. If you do decide to go through with it.