An XY plotter capable of creating user-generated lego scenes

Computer side:

• GUI for building lego scenes, or just use leocad - Using Leocad
• Read files, maybe LDraw or the user generated file, and create path code - Can read files, working on path code
• Get subroutines coded (pick up part, take away part, etc.) -
• Know location of bin for each piece color
• Loading system of parts onto belt before running
• Pick up piece (magnetically) from large bin of parts. Need way to orient parts (magnet at base of bin?) Hall effect sensor or camera to tell if it's picked up?