Hello
you don't have to cut anything, just take off all the existing tarboards of the pan to sit directly on the sheetmetal. BUT I show you what I made as I felt it makes it sit more rigid so all of the movement goes on shifting and not twisting the shifter
The shifter in the pictures is actually set the other way -the night hours are tough!- but anyway you get the point, hope it helps a little
Oh I forgot you'll have to shorten the hand brake if you have any as it messes with the shifter
Friendly
Dimitrios