Hand made tools
The grooving plane was a modified 18mm shoulder plane, that happened to have a 6mm wide ‘other end’ of the iron. With a 6mm by 6mm rebate on either side, and a bevel on the end, I then put a couple of nicking blades in front, and a couple of bushings to use to mount a side fence, and it all came together. Because the bushings are mounted in through holes, the fence can be mounted on either side, to allow for grain direction.
The knifing gauge uses a length of square stock, with a bushing embedded in the end of the arm to hold the blade. The stock is the same profile as the blade, so that rotating the blade 45 degrees presents the cutting corners. The fence is a stack of the same stock that the bar is made from, to make the glue up easy. The fact that the stock is standard, means I can also replace the knifing arm with a pin arm, or pencil arm.
The shoulder squares were cut from a standard profile, braced against some wood, to avoid damaging the edges. The fishtail chisel was a cheap chisel that I ground down at work.
Router plane was the usual hex wrench mounted in a hardwood body, held in to a matching hex profile in the back using an eye bolt.