With what I had learned from my trial fit, I needed to make a few cuts and changes to the other three beams.
Much of the day went on notching out the remaining beams.
After this, I cut 4 plates out of some 150 mm x 10 mm stock steel plates.
I drilled two bolting holes in each piece and then spent most of the day welding these on to the notch.
Towards the end of the day I started working on marking up the position for additional supporting plate so that the beams will adequately support each arm of the bay window.
Just as it was getting dark I managed to tack one of these plates in to position.
On Monday and Tuesday evenings after work, I managed to tack in the remaining three platforms and then perform a full weld across the joint.
By Wednesday I was able to complete some more work on one of the beams.
I welded a knee brace in under the extra support platform.
Then I reapplied rust converter and washed it off the next morning with a power washer.
On Thursday I applied the zinc primer and several hours later the top enamel coat.
I had hoped to install this one beam out on site on Saturday but by Friday evening the enamel coat was still quite tacky.
I will stay home on Saturday and create knee braces for the remaining three beams.