Sorted Older, 26" wheel, steel frame for the taller gent.....

[27motorhead]

Thorn went through a period of saying bigger people needed smaller wheels, and that cantis were superior to disc brakes
So it might be worth looking on ebay for a frame from that early 2000s period, as they used some nice tubes and the geometry might well be what you're after

And they did some crazy tall head tubes too that @Tootyred is after!

 

[Spankyfart]

Not what you want, but they are there.
Maybe even a tad larger then you'd want, this one is huge.



https://www.marktplaats.nl/v/fietse...ountainbikes-en-atb/m2102437309-giant-terrago