NEVER spread thermal paste! The spread paste will create insulating bubbles between the processor and the heatsink. You just need to put the equivalent of a pea in the center. The pressure and heat will spread without creating bubbles.
Cool project! I watched both part 1 and 2. In part 1, I could easily hear what you were saying. In part 2, I could hardly hear you.. the music should be off while you are talking. Thanks for the video...