From the upright centre line marked and cut a slot.
Then cut and filed some pieces like so.
They fit in the bottom bit.
Then drilled a series of holes and filed the slots in the side.
Then cut to the height required.
And filed the curved corner.
Once happy with the alignment of everything, loctited some angle blocks in place.
Now I can spot weld the two together.
Like so. Then warm up the temporary blocks and removed them.
Then tacked the other fixing points.
And dressed back.
A coupe of pics.
Remembered to add the rounded corner when they were off this time.
These have taken so much time to do but pleased so far. Just the reinforcing ribs on the top surface to go. Not entirely sure how to tackle them yet so some trials on some scrap bits first. Have a good w/end, Dave.