nooooooooooooooooo
do not use integer instead of float to save space!
a better idea is to hack out some of the lesser used routines
the two arc functions are good candidates to lose
G2 and G3 in the Gcode file
you could also discard the spindle controls if you're not using them
M3 M4 and M5 in the Mcode file
if you do make changes, let me know what you did
cheers and good luck
Mike
PS could always buy a bigger Arduino 