This might make it in FTB, actually. Their current packs are pretty much frozen for 1.5.2 while they're waiting on the 1.6.2 mods to reach stable releases, and it's on their suggested 1.6 mods list and hasn't been officially rejected. It just needs a big push (like getting Dire to at least spotlight it even if he won't actually make a new DireUFO with it) I think.
As for the the tiers, End stone is much less difficult to get when you can use Mystcraft to skirt the End exiting issue. Emerald's hit or miss on being easy or hard. Obsidian being lower than Diamond is puzzling, considering you put Obsidian before Nether Quartz because of needing Obsidian to get to the nether, since you need Diamond to get Obsidian.
It also seems like there's too many tiers of carriages. Ten is a bit ridiculous. Perhaps carriages could be limited to structurally strong things (Wood, Stone, Iron, Obsidian, Nether Quartz, End Stone) while Drives and Capacitors go through more "tech-like" minerals (I would list them, but it's the same list of materials you came up with in the same order).