The only major component he still needs is a power source of high-energy density. Something to kick-start the Cube.
10 seconds sound clip from the The Avengers (2012) movie soundboard.
You can hear this line at 00:54:35 in the Blu-ray version of the movie.
Quote context
[...]
- Also, it means the portal can open as wide and stay open as long, as Loki wants.
- Raise the mizzenmast. Jib the topsails.
- That man is playing Galaga. He thought we wouldn't notice, but we did.
- How does Fury even see these?
- The rest of the raw materials, Agent Barton can get his hands on pretty easily.
- When did you become an expert in thermonuclear astrophysics?
- The packet, Selvig's notes, the extraction theory papers.
- Am I the only one who did the reading?
- Does Loki need any particular kind of power source?
- He would have to heat the Cube to 120-million Kelvin just to break through the Coulomb barrier.
[...]