My friend Hitsuoka san came over yesterday to start welding the chimney. We are basically taking 5cm L angle and using it to tie the 10cm L angle together on two sides. The gives us basically 2 ‘ladders’ which will then be tied together with turnbuckles.
In the pictures below you can see the 5cm angle welded on to the larger vertical pieces. Last picture is of the turnbuckle/angle units that Hitsuoka san welded together. These will be attached to the sides of the chimney (the sides that do not have the 5cm crosspieces attached). The turnbuckles will allow for a bit of adjustment, just in case the chimney gets loose from expansion and contraction.