Ok, help me help you. I completed the quest, but need to know which part of it you are on so I can answer your question. If you're on the part where you finished running around and testing the Magitek, and you have to return to Wedge, Biggs and Cid, you return back where you started. Which at this point happens to be the cliff people like me jump off of on their chocobos while running west from Revenant's Toll. They are at the bottom of the cliff almost tucked in the hole. Just walk out the West gate and drop, you should see them. If you're on another part of that quest, let me know.