I feel like you should heed the advice many posted in this thread to use a proven design.
You're going to spend the same amount of cash if not more than what many proven designs cost with 0 idea of what it will actually sound like.
I asked this same type of question and got the same replies. You want to spend 120-150 on drivers alone with 0 idea of what the end product will sound like.
I think the TriTrix, Zaph Audio, or DIYSoundgroup all would be a better build as you know what to expect. If you knew exactly what you were doing, or had a good idea of what you were doing then sure, I'd so go right on ahead. But I'm not positive you do and I'm not even positive you know exactly what you want as in your first post you say you only care about it getting loud and not SQ. Then in post #3 you say the exact opposite.
Doesn't seem like you have enough grasp yet to design your own speaker.
With the TriTrix design, The Zaph Audio 3 way, The Fusion Quad 4, Karma 8, Alchemy 8, and Fusion 6/MTM, I think there are just too many decent choices for you to, and excuse my language here as I really don't know how else to put it, dick around with just guessing which drivers you need and how to assemble it/power it.
There are just too many glaring mistakes in this thread that make me question if this would turn out well at all vs the tried and true proven designs out there.