You can try this code sir, Im not really sure of the dimensions though I just set it to 584.2mm, I made it into two passes to try it out on your machine and test it out. I also just copied the speed and feed of the G-code you posted, the plunge rate is 300 then the cut speed is 600
Code:
( T3 : 9.5 )G21 G90 G91.1 G64 G40
G0 Z3.0
( T3 : 3.0 )
T3 M6
( First Pass )
G17
M3 S1000
G0 X0.0 Y0.0
G0 Z1.0
G1 F300.0 Z-6.35
G1 F600.0 Y-593.8789
G1 X18.6615 Y-593.2409
G1 X32.5577 Y-591.8112
G1 X46.3239 Y-589.4358
G1 X59.8956 Y-586.1258
G1 X73.2096 Y-581.8966
G1 X86.2036 Y-576.7679
G1 X98.8169 Y-570.7639
G1 X110.9907 Y-563.9124
G1 X122.668 Y-556.2454
G1 X133.7943 Y-547.7989
G1 X144.3177 Y-538.6122
G1 X154.0188 Y-528.8988
G1 X173.6506 Y-510.5416
G1 X195.4041 Y-495.1702
G1 X219.0497 Y-482.9067
G1 X244.1461 Y-473.9798
G1 X270.2251 Y-468.5561
G1 X296.8 Y-466.7369
G1 X323.3749 Y-468.5561
G1 X349.4539 Y-473.9798
G1 X374.5503 Y-482.9067
G1 X398.1959 Y-495.1702
G1 X419.9494 Y-510.5416
G1 X439.5812 Y-528.8988
G1 X449.2823 Y-538.6122
G1 X459.8057 Y-547.7989
G1 X470.932 Y-556.2454
G1 X482.6093 Y-563.9124
G1 X494.7831 Y-570.7639
G1 X507.3964 Y-576.7679
G1 X520.3904 Y-581.8966
G1 X533.7044 Y-586.1258
G1 X547.2761 Y-589.4358
G1 X561.0423 Y-591.8112
G1 X574.9385 Y-593.2409
G1 X593.6 Y-593.8789
G1 Y0.0
G1 X574.9385 Y-0.638
G1 X561.0423 Y-2.0677
G1 X547.2761 Y-4.4431
G1 X533.7044 Y-7.7532
G1 X520.3904 Y-11.9824
G1 X507.3964 Y-17.111
G1 X494.7831 Y-23.1151
G1 X482.6093 Y-29.9666
G1 X470.932 Y-37.6335
G1 X459.8057 Y-46.08
G1 X449.2823 Y-55.2667
G1 X439.5812 Y-64.9801
G1 X419.9494 Y-83.3373
G1 X398.1959 Y-98.7087
G1 X374.5503 Y-110.9723
G1 X349.4539 Y-119.8992
G1 X323.3749 Y-125.3228
G1 X296.8 Y-127.142
G1 X270.2251 Y-125.3228
G1 X244.1461 Y-119.8992
G1 X219.0497 Y-110.9723
G1 X195.4041 Y-98.7087
G1 X173.6506 Y-83.3373
G1 X154.0188 Y-64.9801
G1 X144.3177 Y-55.2667
G1 X133.7943 Y-46.08
G1 X122.668 Y-37.6335
G1 X110.9907 Y-29.9666
G1 X98.8169 Y-23.1151
G1 X86.2036 Y-17.111
G1 X73.2096 Y-11.9824
G1 X59.8956 Y-7.7532
G1 X46.3239 Y-4.4431
G1 X32.5577 Y-2.0677
G1 X18.6615 Y-0.638
G1 X0.0 Y0.0
( Second Pass )
S1000
G1 F300.0 Z-12.7
G1 F600.0 Y-593.8789
G1 X18.6615 Y-593.2409
G1 X32.5577 Y-591.8112
G1 X46.3239 Y-589.4358
G1 X59.8956 Y-586.1258
G1 X73.2096 Y-581.8966
G1 X86.2036 Y-576.7679
G1 X98.8169 Y-570.7639
G1 X110.9907 Y-563.9124
G1 X122.668 Y-556.2454
G1 X133.7943 Y-547.7989
G1 X144.3177 Y-538.6122
G1 X154.0188 Y-528.8988
G1 X173.6506 Y-510.5416
G1 X195.4041 Y-495.1702
G1 X219.0497 Y-482.9067
G1 X244.1461 Y-473.9798
G1 X270.2251 Y-468.5561
G1 X296.8 Y-466.7369
G1 X323.3749 Y-468.5561
G1 X349.4539 Y-473.9798
G1 X374.5503 Y-482.9067
G1 X398.1959 Y-495.1702
G1 X419.9494 Y-510.5416
G1 X439.5812 Y-528.8988
G1 X449.2823 Y-538.6122
G1 X459.8057 Y-547.7989
G1 X470.932 Y-556.2454
G1 X482.6093 Y-563.9124
G1 X494.7831 Y-570.7639
G1 X507.3964 Y-576.7679
G1 X520.3904 Y-581.8966
G1 X533.7044 Y-586.1258
G1 X547.2761 Y-589.4358
G1 X561.0423 Y-591.8112
G1 X574.9385 Y-593.2409
G1 X593.6 Y-593.8789
G1 Y0.0
G1 X574.9385 Y-0.638
G1 X561.0423 Y-2.0677
G1 X547.2761 Y-4.4431
G1 X533.7044 Y-7.7532
G1 X520.3904 Y-11.9824
G1 X507.3964 Y-17.111
G1 X494.7831 Y-23.1151
G1 X482.6093 Y-29.9666
G1 X470.932 Y-37.6335
G1 X459.8057 Y-46.08
G1 X449.2823 Y-55.2667
G1 X439.5812 Y-64.9801
G1 X419.9494 Y-83.3373
G1 X398.1959 Y-98.7087
G1 X374.5503 Y-110.9723
G1 X349.4539 Y-119.8992
G1 X323.3749 Y-125.3228
G1 X296.8 Y-127.142
G1 X270.2251 Y-125.3228
G1 X244.1461 Y-119.8992
G1 X219.0497 Y-110.9723
G1 X195.4041 Y-98.7087
G1 X173.6506 Y-83.3373
G1 X154.0188 Y-64.9801
G1 X144.3177 Y-55.2667
G1 X133.7943 Y-46.08
G1 X122.668 Y-37.6335
G1 X110.9907 Y-29.9666
G1 X98.8169 Y-23.1151
G1 X86.2036 Y-17.111
G1 X73.2096 Y-11.9824
G1 X59.8956 Y-7.7532
G1 X46.3239 Y-4.4431
G1 X32.5577 Y-2.0677
G1 X18.6615 Y-0.638
G1 X0.0 Y0.0
G0 Z3.0
G0 X0 Y0
G0 Z0
M5
M30