My camera died before I got good ones of the conversion on my Father - Son tour this weekend. My father jumped on the converted Trek 900, sight unseen and road it for 120 miles over 3 days around Wisconsin. Super proud, especially as he isn't even a regular biker. The converted mountain bike setup worked super well in giving a cushy ride for a bunch of crushed limestone and gravel. Low gearing was definitely a major plus on the hills.
The converted 1989 Trek 900 (a one-year only model):
With a B72 from 1972:
And just for grins my ride on its first tour under my ownership. A 1983 Trek 620 with 700c wheels (my first builds):
Hard to hate this seat cluster: