The mapmaker (creator) should look a little bit like this:
http://imageshack.us/photo/my-images/266/1slika.jpg/
Categories and contents (more examples than suggestistions)
Ready made buildings:
Watchtowers
short wall
medium wall
long wall
turret post
Etc.
AI
Guard: Has a certain area in which he patrols, has weapons (of course), can be in a team or hostile to all and can respawn if specified so in mapmaker (creator), can ride on the truck
Turret: Stays still (only the shooting part moves), It shoots mini rockets and weaker bullets, can float and stay still in air, (mini) rockets and machine guns (weaker bullets) have a little range also as guards they can be in a team or hostile to all, can be placed on a truck
Truck: Follows the same route all the time, it's indestructible, can fly, float and go on blocks (of course), it will destroy / kill everyone and everything on it's way and it can transport players
Block runner: Runs (slides) away from players, can be used for playing football (soccer) YAY Football :)
Also I wanted to mention that there could be a football (soccer) mode with only one (indestructible) block runner
Blocks: Decide shape, amount and colour of blocks to be placed, should look something like this:
http://imageshack.us/photo/my-images/211/2slika.jpg/
Water bedrock tool
I think we should be able to place bedrock and water anywhere we want
This is what I think it could look like:
http://imageshack.us/photo/my-images/17/3slikav.jpg/
Spawn
Places where a player can spawn,it is necessary for a map to have a certain amount of spawn points
Special blocks
Glow block (obviously glows) costs 7 blocks
Supporter block (takes longer to destroy) costs 8 blocks
Crybaby (on hit little cubes slide down the block) (and do nothing) costs 4 blocks
Douchebag (breaks if stood on) (great for traps) costs 10 blocks
player should be able to carry 60 blocks, and have an inventory for special blocks