I agree that a marking knife would have been better. When you are trying to get measurements correct down to fractions of a mm it is a bit difficult with a Stanley knife blade.
Regarding depth, it would be nice to have a fret saw with a depth gauge, but as this FB will be flat it will make it a bit easier to get a constant depth. Just eyeballing the little saw it looks like I will be able to use the teeth as a rough depth gauge. I guess I'll find out soon.