Question, do you have OS3.1, 3.5 or 3.9 with you? If you do, simply take the SIMharddrive out of the 4000, put the new one in, format it with a fresh install of the Workbench, make the SIMhd a slave, install it in the 4000, and just copy all the files to the new harddrive.
Keep it simple and you'll have less trouble.
Although Amiga Forever is cool, if you want to take your amiga anywhere if you've got a laptop.