And other photos show Kate collaborating with her two co-designers, Andrée Davies, 55, and Adam White, 45, to complete the "Back to Nature"-themed garden, which is meant to be a fun place for families to experience a natural environment together and enjoy the relaxing benefits of nature".
Kate, who has taken on a very hands-on role to add inspiration and practical ideas for the garden, first revealed her unique plans in February.
"I really feel that nature and being interactive outdoors has huge benefits on our physical and mental wellbeing, particularly for young children".
Her plot, titled Back To Nature, is meant to rekindle the magic of childhood, with Kate wanting the garden to be a playground for children and adults to enjoy and take time to relax.
Speaking ahead of the garden's unveiling, she said spending time outdoors can help children grow up to become "happy, healthy adults". The treehouse is made from chestnut, with hazel, stag horn oak and larch nest cladding. 3/4.
Amazon Updates Fire 7 Tablets
What looked like a promising market has devolved into a collection of low-quality tablets from no-name manufacturers. We're still talking about a 1.3GHz quad-core processor, though Amazon said the processor has more memory bandwidth.
The garden includes an array of plants and flowers fitting the "multi-sensory" green and blue theme, including forget-me-nots, the late Princess Diana's favourite flowers. "The garden forms part of Her Royal Highness's ongoing work on early childhood development and her mission to support efforts that give every child the best possible start in life", the statement reads. The garden will be filled with incredible edibles, plants for craft activities, forest scents and a diverse range of plants, shrubs and trees of different heights and textures.
In her letter to the steering group, Kate wrote: "Through our work, you have reaffirmed my belief of just how timely it is to focus on what happens in the early years of life, and how pivotal a stage of life this is for a child's future".
The space, which Kate hopes will inspire families "to get outside" and "enjoy nature", features a tree house, waterfall rustic den and a campfire as well as tree stumps, stepping stones and a hollow log for children to play on.