Question: Edgeworth diagram in Maple ?

Hello, i am a student from Germany and have a question:

for a  written paper in microeconomics I have to draw an "Edgeworth Diagram" in Maple, so I have to display two functions ( indifference curves) in one box, which has two x axis and two y axis. All axis have to be positive and in one box. Maybe you can imagine one standard graph with x and y axis as a half of a cube, which gets completed by an other x and y axis with negative values (in our imagination, later the negative values should be transformed into positive values). All in all I have to build up a box with two complete coordinate systems. I mean that a need a plot with two different x axis and two different y axis. I read about but the possibility to define lines through the plottools package, but I really dont know.

Maybe one of you has an idea, which would be fantastic. If you cant follow my bad description, maybe its better to google "edgeworth diagram". 

Thank you all !