I don't have the external headlight relays yet either. I consider it a lower prioirty in my wiring than getting things running....
While you are doing all of this you should put in a 1G neon power distribution center fuse box.
The Neon PDC can be used to replace all of your fusible links and relays with a single box. The wire colors are even mostly the same. I have scans of its schematics if you would like them.
It should even have 2 extra relays to use for your high and low beams for most people. I used them for other features with megasquirt but they could just as easily be used for headlights. Just get two of them from the junkyard and populate the unused sockets with wires from the second PDC box.
I have the starter, ac, fuel pump, ASD, AC, and Fan relays all in the box.
I had to change a few relay connections because they use a solid state fan relay to control fan speed and I just used a standard one for a single speed. That change was really easy and I can post up the changes for that.
After putting all of the stock relays in the PDC You should still have 2 spare relays and the unused neon horn relay and a fog light relay after changing the old ABS relay to a fan relay.
Plus you can reuse the neon horn relay for something else (they had a grounded horn so they needed a relay to power the horn where ours is powered).
I am really liking the PDC compared to random relays all over the engine bay.
In my case, I am also using one as a purge relay (megasquirt transistor isolation setup similar to fan control), Electric power steering switch High/Low relay, and Fan on with AC isolation relay (megasqurit doesn't control this and I want the ac switch to turn on the fan but the fan shouldn't turn on the AC).
-Rich