Sure, we could build a pyramid. In fact, with our technology we could build one much faster! As others have explained, the pyramid is a very straight forward design. However, I don't think we could build the pyramids faster [under the SAME conditions] without using modern technology.
My reasons:
1. New evidence suggests that many of the builders were not enslaved. Instead there were volunteers and paid builders. They had a very strong spiritual commitment. They took pride in being a part of what was believed to be a noble cause.
2. They had the construction process down to a science, with years of experience. One should never doubt just how advanced the Egyptian civilization really was.
Everyone else...any thoughts?