Windows NT has never (and will never) run natively on any Macintosh.
You can only run SUSE on PowerPC so that's your first (and only real) consideration. If you want to run MacOS as well as Linux, then you can use the MOL (Mac on Linux virtual Mac) to run MacOS in a window or full screen (runs MacOS 8.6 or later without a ROM image), this means you can get away with just installing SUSe and running MOL (which if you have a reasonable machine should be plenty fast enough because it runs natively)
If you realy want to have NT (and I can't think of a single reason why you would want to if you have a Mac AND Linux) You would have to go for something like a PCI plugin x86 card, it's not a great solution and I think you would be better offgetting a cheap PC just for NT (if you realy insist on it)