I will add some input to this topic.
First, GCI and CCI have very similar supports, due to a splitting off of staff in the mid-90's. They are not the same, because they don't use the same Engineers, but the style is similar.
You can support a ride any way you want, you don't need to constrain yourself to any particular ride manufacturer. You can use their ideas to help guide you on designing your own structure.
The key things you need to keep an eye out for are this different types of bracing. Here is a diagram that shows some of the names for each piece. This is not a complete bent, and this is actually a railroad bent, but it gives a good general idea.
On tall supporting structures, lateral bracing is needed because of the dynamics of the ride. When the train rolls over a tall hill, it makes this section very top heavy, so lateral bracing helps keep the structure from tipping over. Shorter hills do not need as much, if any, lateral bracing.
Fear the Four actually had the right idea, recommending you to look at existing structures to help understand them. Scour various wooden coasters on
www.rcdb.com and you should be able to get a general knowledge of what is actually going on with the structure.