Quoted from FatPanda:
I'm wondering how practical or possible it is to have ramps, targets, etc extend into the main section of the screen, down the sides, and to program the screen that would integrate with the extended modular section of the playfield,
This can be done, the side targets can be removed and replaced with something else should someone wish to engineer it,you want another set of sling shots? Go ahead, do it. The ramps are removable as well, you want a crossing set of ramps? Go ahead, do it. If someone has the programming skill they can do whatever they want with integrating the screen with whatever physical objects are on the playfield. Hell, you can also remove the button assembly and design your own to use, you want demo man style triggers? Go ahead, do it.
The only thing that is not modular is the wall scoops (you don't have to use them if you don't want to, but they have to stay in the game) and the LCD, everything else is fair game to design as you want.
As Gerry stated, once they get 500-1000 P3 in peoples hands there will be more incentive for third party developers to engineer and build their own modules and games. Until then people can design their own games using any of the current playfields. You think you have a great game that can use the Lexy Lightspeed playfield? Go ahead and program it.
The TL;DR version is yes, you can do just about anything you can imagine and/or engineer.
They just need to get more machines into peoples hands.
Also toyguy types faster than I do...