There are two main types of three tree configuration; clusters and widely spread trees. A cluster of trees can initially seem like a great place to put a treehouse, and it would be if it wasn't for tree movement. A close group of trees is an awkward place to set up a flexible support network. Sometimes the best thing to do is leave a tree out of the support system altogether. This tree can still be allowed to come up through the platform, but you will find things easier when you only have two trees to contend with.
Wider spaced groups of three trees can be challenging to build in, but the reward is greater floor area if you can gain solid support from another point on your platform.
Every set of three trees is different, but if you read through this whole construction section you should pick up some inspiration to design something yourself. Bear in mind the trees are normally in charge when it comes to how your floor will look. Non-conformist floor spaces can lead to much more interesting architecture so let your treehouse design be flexible in this area.
In the example above, for instance, part of the floor extends slightly further to the right than the rest. Note also how the central support is suspended from a cable. This cable is not fixed to the beam, but instead runs between the two right hand trees through an eye bolt in this central beam.