I just had a thought about the design of the Model 3 and how it relates to a HUD. It has been said how the hood is quite low giving the driver good visibility of the road immediately in front of the car... ...or space to include a (don't know the correct term) clear projection screen inside the windscreen upon which to project HUD information. This keeps the initial cost as well as the replacement cost of the windshield lower. If a Mazda 3 can include one of these at its price point, it doesn't seem out of reach for the Model 3 to include it...and Elon-ize it (i.e. make it more awesome than other systems). It could be a much bigger screen than the industry has seen before.