A good example for the Crusader or Knight class is Henson's Sun Priest build. My personal favorite build from the site, and my main character whenever I play, the Sun Priest starts off a little slow, but after a little work, he becomes incredibly powerful, especially with mods like Apocalypse or SPERG.

Hey Albino, I recently asked in the Help Desk if this was something that had been done before, because I had an idea of making a build series of exactly these classes. I was linked to this and was wondering something.

I gave up my idea as I'm not one to steal an already used concept, but I decided to just go ahead and ask for the green light to overhaul this as it is over 3 years old now(not to say it is dated or bad, rather you did a nice job) and create full, separate, more in depth builds for each class in my own "Character Build: Oblivion Classes" build series.

I would completely understand if you'd rather not have that, and I also don't believe there's anything in the rules explicitly against me using the idea regardless, but I'm asking out of respect for another person's idea and the fact that I and probably others might enjoy having fresher builds like this. Again, I totally understand if you don't want me to touch it, especially as I'm a new builder.

As you said yourself, there's nothing in the rules saying you can't do your own take on an idea that's already been done, so if you want to do your own take on the classes of Oblivion, then go for it. Technically, mine isn't even about the Oblivion classes specifically as it is the (non-spinoff) TES classes in general, hence the name, though it does draw most of its influence from Oblivion (and to a lesser extent Morrowind).