Hello PAQUICINNO
I built the shape in RHINO SUBD but can be built in other poly programs (SUBD did a better job in controlling minimal faces and clean joins) - I then convert to NURBS and use the RHINO COMMAND UNROLL DEVELOPABLE SURFACE to flatten. Pretty easy work flow I then manually split to fit on a sheet I have cut one on a plotter to test all worked perfectly.

Michael - many thanks for the script I am working this up to cut one out in metal would it be possible to add width to the dash in the script as an extra input or leave blank for general use - the straight slot works for paper folding but in metal lets say the metal is 2mm thick to hand fold it would require a slot width of about 2.5 to allow for bending clearances this way this sort of shape can be hand bent in metal then the major joins welded together.