Hey. I am back.
I have worked on this add-on all the time I was away, and I have done a lot of progress. In fact, more than I expected to do, but I was offline, and I could not do many other things and I didn't feel like playing Skyrim.
I can proudly tell that now, my part of the code is close to be complete, all major features are coded, except adding some smaller details, fixing bugs, and maybe coding some expansions. It seriously needs more scenarios now.
Things I have done:
-coded all skills (this was quite a pain, because it's easy, repetitive and therefore boring, so there might be numerous bugs)
-characters have graphics now, however, absolutely no animations, because drawing it all would take me too much time, and I am not an expert on it (the things I have made aren't very good neither)
-spells have missile and explosion animations now (technically converting Heindal's code to lua and drawing some effects)
-all item properties neglected as unimportant before should be working
-bosses (units who have the yellow leader crown) have a chance to drop unique items now, I haven't created many of them (about 4 per item type, but I guess that voluntaries for this might be easy to find)
-added item shops, where items can be sold and bought for gold (they are technically terrain types)
-gold is exported with the character, so each character has his gold (this breaks compatibility with previously exported characters, but it can be fixed, see bellow)
-higher level characters get more attacks per turn now (fighters get more)
-items can be dropped from the inventory on the ground
-networked multiplayer should work without fatal non-stop OoS (but I could not test it)
-documented the lua code with notes what does what and a short readme about new WML tags
-racial skills now work (elves and orcs have some)
-fixed a lot of bugs (surely created much more, though)
The quantity of changes is quite likely to break all save file compatibility, it will load, but WML and lua error will happen a lot (since updated lua will run with outdated WML), so I recommend to start scenarios from the beginning.
Exported characters will seem to have 0 experience, but will get strangely large amounts of gold. To fix this, look into 1.10/persist/various_world_of_wesnoth.cfg and add a million to every number larger than 3 millions (so all numbers like 3003204 should be changed to 4003204). You can use debug mode to fix it too. They will also get some default graphics instead of the actual ones.
I have also meddled into Heindal's code, adding some comments and fixing the problem that teleporting whole sides didn't work well with summons (and also shortened that chunk of code slightly).
I have also committed it, but as nobody gives a damn...
A screenshot of the visible things.