Ok here's the inside:
The area you are going to use is 5x5, you need to make a platform of square goza mats that are raised above your head that are over the 5x5 area, so you will need at least 25 square goza mats (1k worth of cloth).
To place a square goza that high up start with the northwest corner (they don't go invis with circle trans so always start at the top or left of the screen).
To get a goza mat that will sit over your head you will place three tables on each other, then two doom damaged book piles, then target the top pile with the goza. To get "high" enough so you can place the book piles on the tables you have to stand at a higher place than the floor - one way to do this is to create a small staircase (two goza mats next to each other, one raised 2 times and the other raised four), standing on the higher goza you can place the book piles. The second way is to place a ladder next to the work area and stand on it.
After you place the goza mat to keep it from falling you will remove the top-most table then everything else. To move the bottom table you have to be back on the floor. It's a long process, but eventually you should finish off a 5x5 ceiling area that when you walk under it it totally vanishes from sight (this means all the gozas over your head are the same height).
To place the corner hedges you put the tall ones on the gozas above in the corners, then place the ones on the ground. Lower the top ones a few times so the hedges blend with each other but the top hedge still sticks up a bit over where the goza is. I think this is when i chopped the corner gozas.
The overhang above the benches is made from light green campions, you need 8 of them total. You need at least 11 tall hedges and 1 short hedge for where the statue goes.
To place the upper of the two fountains you will do the same thing with the tables/goza (or you can finagle it a bit and place them on the same level as the others but further back so they appear to be on a higher level). I just went ahead and put them on a higher level so I wouldn't have to do any weird navigating around the area when I walk up there.
Another finagly-thing is the elven benches, which sit too low for me visually, so for one of them I place 2 square gozas then raise up 3 times, and the other one I raise up 2 gozas 5 times, then place the benches and chop the gozas. I forget which is which, so just eyeball it if you're going to do this.
You'll have to keep a ladder or build a staircase on the backside if you want to access the fountains. I also replaced the square goza mats that hang over the elven benches with rectangular ones - put down the regtangular goza then hop off and back on a mount and chop the square ones.