I have been running OS4.1 in emulation for awhile. I cant say I enjoyed the trial and error of getting it up and running. However I just saw this and must say it might be the easiest way to get 4.1 running
http://www.amikit.amiga.sk/Flower Pot
Silly name but it simplifies things. Worth checking out for anyone who hasnt already tried OS4.1 in emulation