I have used this method in Darwin, Sale (Vic), Perth and now have 2 trees under cultivation here - maybe I should take some pic's of those
.I recently told Jamie my method would be sure to generate discussion as it is fairly unbelievable, but pup has sort of confirmed (unknowingly) the system works in one of his posts under the "Do we under fertilise" thread. As he said in that post, it is possible to take cuttings/tubestock to 100mm trunked trees in 4 years and a lot less time as well. Only problem is that you really do need to work on the trees constantly.
So to it: Get hold of a large styrene box, and cut as many holes in the bottom as you can, without the bottom breaking. I usually get around 30 holes, each about 30x30mm, but you can make them larger if you like. Cover each hole with individual pieces of mesh, same as a Bonsai Pot.
Now put in a layer of 3 to 7 mm grit. I have used anything up to 10mm by the way. Only mentioned 3to 7 çause thats what everyone adds to their potting medium isn't it
This layer should be around 50mm deep.Now over the grit spread a layer of Pellitized Chook Poo (you know the one) To measure out this layer I use a 100mm flower pot and I put 4 of them in.
Now put 2 pots of Blood and Bone over the Chook Poo, followed by 2 pots of Pelletised slow release fertiliser (again you should know the one).
Lightly mix the three layers together, trying not to disturb the grit layer. (you need that it place to hold all the fertiliser in place, otherwise it will just run straight out the drainage holes when you water)
Now place a hard flat object (I used a lino square) on top of the fertilser. The piece I use is usually about 200mm square, but size isn't important - just make sure there is enough gap around the edges to let the roots get to the fertilizer. Next place a thin layer of grit over the lino, to cushion the roots and place your tree on top of this grit. Spread the roots radially around the trunk and then spread another layer of grit over the top of the roots, leaving about 50mm to the top of the box
Now, fill the rest of the box with Dynamic Lifter, oops pelletised Chook Poo, and water in well. I have found it is beneficial to water again a couple of times as the Chook poo takes up a lot of the water.
Place the tree out in full sun and water as often as necessary.
Now as we need to fertilise our trees regularly
what you should do is refill the box with Chik Poo Weekly. Pup's mate scraps the Poo off every week and replaces it, but with this method there usually isnt anything left on the soil surface at the end of the week as it leaches down through the box. I also throw in a good serve of Blood and Bone at the start of each season and if feeling generous will throw in a couple of handfulls of the pelletised slow release as well then. The trees also get regular foliar feed with whatever I have in the watering can as well. In Darwin I grew Orchids, so the Bonsai got that fertiliser as well 
You will find over time you get quite a bit of fertiliser under the box, which can be scooped out and used on the lawn or elsewhere as it will still be working.
I have used this method to grow some very large trunked Ficus Rubiginosa, Green Island, Little boy (although you do loose the small leaves) Willow Leaf fig, I have also used it to grow Hibiscus, although the flower size will frighten you
. I was also growing an Azalea using this method, however it "passed away" following a watering mishap so not sure of the long term viability for this species.Two things to watch if giving this a try. First, do not neglect watering and secondly keep the root pruning up. Roots will quickly escape the box and get into the ground and we need to keep all the roots in the box so the tree remains being force fed. Trees will need to be rootpruned yearly as the box will fill with course thick roots quickly and the tree will need to be top pruned daily once it gets going. Dont worry about leaf size, although I did defoliate mine 4 or five times a year - just so I could keep an eye on the trunk developement and direction.
As I said in the beginning, this will (hopefully) generate a bit of discussion, but it does work. You will also notice there is absolutely NO soil of any kind involved in this method of growing trees fast.
taking the top half of trees of since 2005! 
