Well, the grass is still waitingto be cut. There is always tomorrow.
First off I produced a drawing to work from. LNER angle trussing is 3.5" x 3.5" and brass angle typically comes in 1 x 1mm (top) or 1.5 x 1.5mm (bottom) sizes. 1mm is quite close but does still look skinny against the real thing. 1.5mm is overscale but considerably stronger and can be thinned down if desired:
Before any attempt at soldering I decided I needed some form of crude jig to help the angles and hold everything correctly. Various pieces of mount board and extra prints of the drawing were cut and glued to form a holding system. Pieces of the 1.5mm angle were used as spacers so that the "slots" were the correct width to hold the angle in place:
This one looks odd as some of the paper template has peeled off:
A length of 1.5mm angle is partially cut through with a piercing saw, bent, and inserted in the jig. Lengths of 1.5mm are trimmed to length and one end rebated to form the uprights. Both parts are tinned:
After soldering and initial cleanup:
For the crosspieces I really needed a jig so used the same technique to make one. Brass angle was partially cut through, filed for the internal angles, bent and slotted into the jig. Due to the way I went about this there were small gaps at the joint that I decided to fill for strength as below. In hindsight I could have assembled the crosspieces by mitering short lengths of angle together but thought that too fiddly:
On removal from the jig and cleanup it does not look too bad:
The other side less so but I doubt it will be seen when in place:
So one set down, one more set to make. Phew!