Root over rock

I've decided to try a root over rock and I need a few pointers. Here is the rock I would like to use. I'm just not to sure about what type of tree would look best. Thinking of a pine or juniper.

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Your rock might work, but I think I would go for a more a rougher stone so the roots have something to hold onto. As to trees, Ficus is probably easiest, but pines and junipers can be used.
As to timing, we are past the season to work on the roots of pines and Junipers in Florida, I am not sure about So. Cal.
The technique is to get a deeper pot, fill about 1/2 full of soil, place stone, bareroot tree and spread exposed roots over stone and then fill pot with soil to the base of the tree, after the tree is growing well, we are talking months here, the soil is gradually removed to expose the roots on the stone.

we are talking months here,

Longer, with pine and juniper (and most other temperate zone trees).

I have an elm over rock and it is very happy, but it makes sense to use a type of tree that might be seen clasping a rock in nature, like pine. I used wet raffia to wrap the roots around the rock. Over time it will decompose into the soil that you have it planted in, but by then the roots will have become accustomed to being around the rock. In a year or two lift the rock/tree as a unit and inspect the roots. If there isnt a good union of the roots to the rock, you can always use raffia again. If the roots are beginning to cling to the rock, put it back in the soil but plant it higher to begin to slowly expose the base of the tree and the top of the rock. Over time the feeder roots will be concentrated on the lower part of the roots/rock and most of the rock can be exposed above the soil. Be sure and take pictures to document the stages you take it through.

Thanks for all the good advice. Since I'm planning on planting in a shallow pot(eventually) I will probably use a tile inside the large pot so the roots grow out vs down.