Grant, it all depends on what your goals are for this tree. It looks good in that pot, but if you want a lot of growth, a bonsai pot is not the way to go. Bonsai pots are for more refined trees, and the small volumn of soil restricts root growth, and thus restricts overall growth.
From reading the thread, it would appear you want it to grow. So, it should go into a larger (wide but shallow) grow box.
Colanders are not appropriate for deciduous. That's a Pine technique.
The thing about deciduous trees is they're created entirely differently than conifers. Conifers, you take what's there and wire it into place. Deciduous, you grow your trunk until you are happy with it. You dont really care about the branches. Once you have a trunk you like, either cut off all the branches and start over, or grow out whips and thread graft branches where you want them.
Then, it's the same process as building trunk. It's growing out primary branches and building in taper and movement.
Once that's done, then it time to build secondaries.
Once you have properly placed secondaries, THEN work on ramification! Believe me, that's the easy part.
You should get Bill Valavanis' book "Classical Bonsai Art". It shows how to develop maple bonsai. (All types really). But with pictures spanning decades of development.