I wonder if using only 1-off corridor connector per gap would enable closer coupling and a more realistic gap? Still looks infinitely better than no connector at all of course.
Loving this thread.
Steve
I note that the brickwork recognises the internal wall but I wonder if 9' walls rather than 41/2" would have been used? i.e. English or Flemish bond i.l.o. stretcher / garden wall bond? Super research and photo interpretation by the way.
Steve
The stiffest (in respect of resisting bending) will be the rib with the tallest section possible i.e. instead of 2 x 1 a piece of 4 x ½ would be much better in resisting the bend / sag. Forget the steel (unless it's very deep) and perhaps try a 6" or 9" strip of 9 m.m. ply. I have used board sides of 4 m.m. ply around 9" deep for boards 4' to 5' long and they don't bend longitudinally. Diagonal bracing (also 4 m.m. thick) resists twisting and supports the 6 m.m. track base. The sides and braces have a small flange 10 m.m. x 4 m.m. along the bottom edge to keep them straight.
Steve
Although the nose of the wire part of the couplings is similar, I do not think that they are Alec Jackson couplings. There is not a horizontal loop / bar or curved 'lifter' in Alec's design as far as I know.