I made this one several years ago, Hortic!
It's 6'0" long x 4'0" high, built from tanalised 1.5" x 1" batten, (screwed at each crossover), with equal squares 8" apart, 3" x 3" posts each end, with the feet bashed down onto a drive-in metal ground spike, and bolted or nailed secure.
We coated it with fence paint before we put the tree in, and that is in fact a pear tree, and although it was originally an espalier, we formed the 'cone' design instead, because the branches tended to go that way and were more 'relaxed'!
Hope this helps!