We recently replaced the small Princess two burner stovetop with a three burner Furrion. Had to cut the hole about 7" wider and 2" deeper.
I used a variable speed jigsaw at low speed with a new bimetal blade, duct taped the cut line and it cut the Karadon perfectly. I wasn't too concerned about small imperfections because the new burner overlapped the cut line by 1", but to my surprise the Karadon cut easily with no chipping or cracking.
Just take your time, go slow and use a new high quality blade.
2000 Alpine 36 FDS #74058
04 Jeep Wrangler TJ
"On the road to find out..."