It's a shame to have nice historic bricks hidden away in the garage and I'm glad to know you're pulling them out of there and letting them see daylight. To be honest, though, I doubt the district will approve of three different materials for the driveway. But then, it doesn't hurt to try, right? The bricks would also make a great patio or walkway.
I think 16' feet wide is the norm for 2 cars, but you could go as narrow as 14 as a tight sqeeze for larger cars.
The base for the pavers is the same for concrete and asphalt - a minimum of 4" compacted gravel on undisturbed or compacted soil. In other words, the driveway plot would be dug down a minimum of 8", and the filled with 4" of gravel. Every 2" the gravel would be tampped (compacted). However, the deeper the gravel the better. It's not uncommon to dig 12" and have 8" of compacted gravel.
By the way, it would be great if you could share some photos of the project so others can see how it's done, and so we can get a peek at those historic pavers.