Always remember that if you change the way one thing on your boat works, it may impact many other things, including things you might not have thought about.
Take raising the boom as an example (btw, quickvocab lesson-the outhaul is connected to the boom,and the boom is connected to the mast and the mast sits on the mast step, and the green grass grew all aro... er, you get the point.)-
If you raise the boom, it means your mainsail will not fit. The mast is still the same height, and if the boom is higher on the mast, it means you have a sail that is too long. But it is not just too long, it is now also the wrong shape. So now you need a new main, or some pretty drastic work done to your existing main. It is also going to change the way your boat sails, because you have now moved the center of effort upwards, and have depowered the boat but cutting down on the size of the main. Meanwhile, by making your cabin house taller, the sail area you lost on the main you have sorta added to the top of your cabin, which may have an impact on how your boat handles, especially when maneuvering in tight quarters, like coming into a slip with the wind on your beam (from the side.)
Here's a great place to translate terms you hear here which are unfamiliar: