In the January 2020 issue, Donald M. Deuell described how he modified plans from a 1950s Model Railraoder article so he could add an operating spout to an HO scale wood water tower. See a PDF version of this by clicking here.
Plans for a wooden railroad water tank
By Angela Cotey | November 20, 2019
| Last updated on January 12, 2021
Get project plans for this classic trackside structure
From the plan Doug built the tank I assume he used the vid of Steve Otte to modify his tank?
http://mrv.trains.com/series/video-step-by-step/2013/06/video-step-by-step-build-a-water-tank-part-1