Do you really want to change the working volume?
CONGRATULATIONS!
The hard work of Carlos Garcia Saura designing in a vey parametrized way makes it kid's stuff.
Even when I have no idea how Openscad works, I succesfully have change the free space under the tool with the following steps:
1. Open Cyclone-PCB-Factory-master/Source_files/Cyclone.scad with Openscad.
Is a Cyclone render there?
No: Press F5
Si: Cool
2. Open Cyclone-PCB-Factory-master/Source_files/configs/Default_config.h with a text editor.
I edited line 26 from:

axes_Xreference_height = 74 + animatePart(6); // relative to Y reference
to:
axes_Xreference_height = 70+74 + animatePart(6); // relative to Y reference
3. Save Default_config.h
After saving, the new dimension appears in Openscad Automagically.
... and that's all :-)

But now you wish the .stl of the new parts Isn't it?
1. Edit Cyclone.scad L109 from:
Cyclone_X_leftFrame();
to
!Cyclone_X_leftFrame();
2. Render with F5, and generate .stl with the STL button.
Don't worry about the other little parts, you could remove them using the option "split into parts" if you use the slicer software: "Cura"
Have a nice time.