Here is exactly what I did this weekend to mod a 1.1 xbox using the 007 hack and slayer's autoinstaller.
1. Get the 007 evox installer save game on a memory card. FTP to a friend's modded xbox is the easiest method. Once the game in ftp'd to the modded xbox, just copy it over to a mem card using the ms dash memory menu. It is important that you also load the bios image you are going to use into the bios folder under the gamesave, so that when evox boots through 007 later you can flash. Make sure it is a 1024kb image.
2. Open the unmodded xbox and solder the write protect jumpers. The easiest way to do this is to use a very thin piece of uninsulated wire, and cross the points with it. I find that trying to glob solder across the points tends to make a mess, you can do a very clean install using a wire instead. Use a nice long wire, solder it to one point, then lay it across the other point and tack it down. Once it's bridged just wiggle the wire till it snaps off, leaving only the 1-2mm across the points.
3. Now fire up 007 in the unmodded xbox. Once the main menu is up go to load game and select the memory card that you copied the hacked gamesave onto. The screen should go black and in a few seconds you should see the evox menu.
4. Go into system settings and then select flash bios. Choose the bios you copied over in step 1. If you get a message saying "flash not write enabled" or something like that then go check your solder points, you missed one. You should get a message telling you what version bios you have, and then it will ask you to confirm. Once you do, do not touch anything. If your xbox crashes, powers off, etc, during this part, you're going to need to install a mod chip to fix it. You will see the existing bios being erased, then the new image loaded. Your xbox will now power off and you're modded.
5. Insert the Slayer's evox installer cd and turn the box on. Build the box as you wish, I choose "install evox on retail HDD". Once this completes, remove the evox installer cd/dvd and reboot. You should boot directly into evox.
That's it. 15 minutes tops and you're modded and ready to go, basically for free. Does not get much better than that.
Later,