IF you find that you’re able to do this and the bed mat does not conflict with the adapter (I’m doubtful as well), using some sort of “transfer marks” to layout will be difficult and likely not perfect.
Do the layout like this.
- Mark center of bed and center of mat transversely.
- Mark center of GN hole longitudinal measuring from front of bed and front of mat (after you account for how mat fits if not tight to the front of the bed.
- measure and mark 5ver holes from center of gn hole as reference.
-check square and dimensions before scribing holes to cut.
-run hole saw in reverse if using a hole saw. Or just cut with a utility knife. Hole saw will burn through the rubber essentially but works good, although you’ll probably need a second handle on the drill.
