Made a prototype of a singleplayer map. I was going to make a map where you have only 1 day to do stuff but it turned out the minimum time limit is 2 days
Anyway, you start on an island full of stuff (literally). There are also a few enemy towns and one hero with quite strong army. You must defeat them before the end of day 2. Also the choice of starting town is crucial since you get dwellings for that town. This is version 1.00 and it's not very aesthetic yet but it should be totally playable. And I believe at 80% it's not even impossible
I just started a game in your map. And I have to say I really like the idea. Will play it tomorrow.
One quick observation. Like you've said the looks are not it's strongest part. Maybe a stable near your main castle will enable a slightly bigger => nicer map?
Second I do not like reading map messages. But since this one is very different from a normal map, a short warning/victory condition listing would help.