I was going to make an original loom just using the Sierra fuse box, but ended up basically replicating the Sierra layout of the fuses and relays for the things that remained. This way the fuse ratings and wire gauges are right everywhere, and most of the crimped connections inside could remain. It's not a bad option if you don't find the Sierra fuse box fugly. The Sierra wiring is relatively pedestrian (I had a 1993 Mondeo loom to break apart, too, that was way more complex), but you get a couple of spare relays and fuses for stuff you might want to add (ECU, fuel pump, rad fan and such in my case).
Here's the diagram I pasted inside the fusebox lid. Maybe you'll find it any use.
