Made some progress on the forge yesterday and the first thing I needed to do was to get a hole through for the gas supply. I read some more on the angel of delivery and ended up going with the full 30 degree offset. So lots of 1/8 in holes round the perimeter

Some time with a good 1/2 round file, the insulation in and away down to the garrage to get the the end welded on and the outer gas delivery pipe welded in

The venturi system has a nice air supply regulator with it fully open here for full heat forging. I saw a video with this gas system and he reached welding heat in 2 1/2 minutes

And closed right down. For the heat treating the air supply is closed down quite a bit to controll the temperature