Latest version of windows with PowerPC support was NT4, and I doubt that is the proper "type" of support for use on a mac. Not to mention there won't be a chance in *censored* of finding the right drivers anyway.
You can install windows within a virtualization environment, but aside from that you aren't going to get any semi-modern version of windows running- natively- on the system, and even if you do you won't be able to run about 99.9999% of windows programs since they will be compiled for either x86 or x64.
What do you think?
It's not a matter of opinion wether you can get, say, Windows XP running on a PowerPC. it's an established fact. 2000 and up don't have a PowerPC version, and NT and earlier are unlikely to even be able to install, let alone be able to find drivers or run any sort of windows software, which would sort of defeat the entire purpose of installing windows in the first place.