I have these suckers, I am just too nervous to try one on a guitar body for fear of toasting the build. They also do not normally come with a guide bearing.
I have a couple of those too. One of them I got and foolishly tried it out in a handheld router. No real risk to my fingers, but sure enough it ruined my workpiece. That thing was like a propeller just trying to take off. Another one I have was only slightly smaller but didn't feel like it was gonna launch my router into the air. It actually worked quite nicely, but it's just not a look I'm crazy about. I would have much rather just carve it by hand.
You would need to use that large bit in small depth steps. Spooky scary stuff. You have nerves of steel my hats off to you. i Guess I could hobble together a body plank from some shop scrap and give it a try someday, but I don't think I have anything with a bearing guide. There is also the vertical panel raising bits but the logistics of rotating the guitar on its edge makes it useless for guitars. I guess if you are desperate to machine a perfect carved top only a cnc router will do as you can carve the entire top anyway you want. Unlike a router bit in a handheld router or router table.