Just been down in the shed. (ignore the sink paste for now was literally using it for spacial reference) removed all the fans from the sinks. Marked up.
Using a 2.5mm hss bit to drill
And tapping for the m3 screws. (that I actually forgot to order)
That's all there is to this bit to be honest. 9 more to go.
And @ReikoX not one for faffing about myself bro. Hoping to get it up and over something ASAP. I sent half the autos you shipped me out to @Gaz29 today too. Was supposed to be yesterday but never got to the postbox due to being high af