Well, it's a start at least - give it a few weeks to start to fill in and hopefully it'll look pretty good.
Things I learned today:
1. 10 bunches of ludwigia is practically enough to fill a 15 gallon tank all on it's own. The clump in the back left corner is only two bunches, the other eight didn't get used.
2. I really, really, really, really hate rockwool. Between the 12 pots of HC and the 8 of hairgrass, that was 20 pots I had to remove the plants them and then try to pick out as much of the rockwool as possible while still leaving the roots as intact as possible.
3. The reason no one sells duckweed specifically is because they include it anyway, caught up in every other plant that they do sell. Ended up with a ton of the stuff, as well as some frogbit.
4. I shoulda ordered more HC. 12 pots came up a bit shy, I could have used another 4-5 easily.