Hero Siege map request

[ravellani]

My Warcraft 3 terraining is much to be desired and the project I am working on needs a map.
Some simple requirements are:

1. The map must be 320 by 320
2. The middle should be the 4 line area for the hero siege with walls. The space should be pretty big.
3. The ends of the lanes should open up into a forest that is the rest of the map.
4. Put some places for camps and city's.
5. There should be no space to exit the paths with a ground unit(trees).
6. Try to be symmetrical on all sides if possible.

Tile set should be foresty but thats about it. I just need the map because I have the units and triggers.
Thank you in advance and I will rep anyone who helps. Feel free to ask questions if its doable.