Variations
Alternative designs, improvements on the prototype plans are suggested here to encourage some experimentation.
Rail system:
The accurate construction of external rails for wheeled or sliding trays proved somewhat problematic, as noted in Lessons.
This could be avoided by using an unsupported 'stub' rail and a ‘resting rail’ instead, as illustrated below. A reasonably strong person could then easily slide a full tray out far enough to hoist it over the resting rail where the contents becomes fully accessible for processing.
Adding more trays:
The 'resting rail' approach can be further developed to include the single-handed processing of a second row of trays built in above this. With the lower tray fully extended the upper tray could be pulled most of the way out and rested there.
With two people to manually lift the trays up and down it is conceivable that a drier could have 2, 3 or more levels of trays as indicated above. Drying in the lower trays would be slower but their positions could be changed as the drying progressed. For that kind of tray re-stacking a double-resting rail would be useful.