Enclosure for Mendel Prusa printer

Preliminary design for a standrad Mendel Prusa printer. Design goals:
* Combine printer, PSU, RAMPS controller and LCD+keypad into on box.
* Allow printer to be easily put in and out of box (top bar can be unscrewed to allow printer to be taken out/in).
* High visibility on printing process (plexiglass windows surrounding machine).
* Easy access to print platform and end-stops (hinged flap on front, semi-attached flap on the back.
* As air tight as possible to keep toxic ABS fumes enclosed and stabilize temperature control.
* Don't use toxic air to cool PSU and controller.
* Integrate spindle holder on machine (with multi-extruder/spindles as option.

Design was done keeping in mind standard wood pieces and plexiglass. FreeCAD is used to make the design.