The Outdoor Willow Feeder (WilloWonka) is a skiddable outhouse design that keeps human poop out of rivers and groundwater. Unlike composting toilets or septic tanks, it separates poop from urine and greywater, stores solids in sealed cans to age safely, and uses them as nutrient-rich fertilizer for willows and other trees. The trombe wall ventilation system moves air with the sun, meaning no fans, no smell, and no electricity.
The PDF includes 58 pages of detailed building instructions, drawings, and notes.
In the PDF Plans You’ll See
• Complete materials list including roundwood sizes, hardware, and plumbing parts
• Step-by-step build instructions for skids, posts, beams, rafters, roof, siding, stairs, and hatch
• How to install a urine diverter and connect it to a mulch pit for safe greywater use
• Trombe wall details for natural passive airflow and odor control
• Seat design, bucket clearances, and sealing tips for everyday ease of use
• How to add a fly trap to the vent stack for cleaner, safer operation
• Guidelines for aging and safely cycling nutrients back to trees
• Practical safety notes for working with roundwood and tools
• Why this design outperforms septic systems at a fraction of the cost
• Lessons learned from real-world testing at Wheaton Labs
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