Mance's Camp is one of the last remaining mammoth tasks (pun intended) on the server, and IMO the most difficult one. For a number of reasons.
To create a compelling version of this very unique part of Westeros, we need to find answers to a number of questions.
What is Mance's Camp not?
Mance's Camp is not a settlement we usually create. Usually we build villages, towns or cities and assume they are static entities. Houses, walls, castles, those are all rather reliable so we can safely expect them to still be where we left them when we come back after a week, month, or year.
What is Mance's Camp?
Thousands and thousands of refugee wildlings fleeing an unknown terror. Through icy winds, rough terrain, deep snow. The cold. It's a death trail. Thousands of people marching south, thousands of people in motion, plowing through the snow, leaving behind a trail of destruction and death: all trees are cut down and burnt, all wild animals hunted or scared off, broken down sleds or tents, dead horses, dead lifestock, dead people. Fights for food or firewood. Old and sick dying, children dying, and no time to bury them. Whole families freeze to death in their sleep. They are all left behind.
And every day the camp moves on.
Then the camp, or rather, the camps: Families stick together, tribes distrust each other. Every night there are fights for food, for resources, for the best places to camp for the night. There's group pressing forward to be the first at the prime spots. There's others that fall behind. Some try to find their own ways south,... In fact, the entire north would show signs of people fleeing south.
In order to depict these dynamics, Mance's Camp is much, much more than building tents. It's mostly a terraforming project.
Where does that leave us in regards to this app?
I can see two different approaches to this, both with different pro's and con's:
a) We Stick
We simply split the project into a Camp and a Trail/Environs part, and, if you don't want to blow this project up into something you didn't really feel up to, you focus on the former, while we hope someone will pick up the latter eventually.
b) We are stuck
We decide it's better to follow each families trail from the start and roll this project up from the start by focussing on the latter aspect first before seeing where each all these people would have ended up at.
Either way we go, here's a bit of hands-on feedback for you:
a) The Location
The nature of Mance's Camp (people on the move) suggests that there is a somewhere all these people came from. The current location (at the far end of a number of valley surrounded by very tall, very rocky mountains) does not really help tell this tale. I suggest moving the camp east to the main river coming south from the Thenns (if that does not conflict canon).
b) The Communities
The camp as I understand it consists of numerous clans and tribes and families who all aren't quite friendly with one another. They'd all stick to one another and try and protect their immediate kin not only from the cold or icy terrors, but also all these other tribes they learned to distrust. The entire camp should be more spread out, and clearly depict individual communities.
c) The Resources
All these people need to eat, drink and stay warm. There'd be hunting parties sent out in all directions, trees cut down, etc etc. Lifestock and horses need food also, so this needs to be depicted.
d) The (immediate) Terrain
Wherever the camp ends up at (if we decide to move it), the terrain will need fixing. The rivers are bad and could be made much nicer, the immediate surroundigns should show the things I listed above, the mountains, cliffs, plains etc all need detailing.
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I know you've been interested in Mance's for a long time. The tent tests are cute and work great (love the yurts). But, you said it yourself, you didn't put much effort into it. I think due to its very unique nature, Mance's deserves a bit more of that.