Castle defense idea

Make 5 castles with pile of gold harvestable, each guild have to put gold in the pile (up to a million)
For each 100k in the pile, a treasure chest spawn (only one by castle) and is lootable everyday by that guild that own the castle, the number of gold in the pile determine the tier of the loot the chest hold (tier1 to tier10)
Value in that chest must reflect the gold worth (or at least half). Dungeon blueprint, mossy handle, 10x elven string of speed, etc. (the fall loot could be in that!) I can make a list of worthy items that could be droppable in those chest if required.
You could use coto instead of gold to increase the value of the pile of gold! 1 coto = 100 gold!

At the end of the week, friday or saturday at a certain hour (define one, and stick with it) The value of the gold pile is halfed. (Server take half!)
Castle siege last 1 hour. During that time, opponent of all over the world can come and harvest that pile of gold to take the gold out.
Each time someone harvest, it take exactly 5 second and its always a success, that person get 1k gold off the pile.
With 100k gold, that mean 100 tries at 5 second each. 500 second for a single person to loot. (if hes not getting interupted by getting attacked!)
Example: A guild with 6 member go and attack castle, they make it to the treasure room and kill the whole team that was defending it, they start harvesting the gold.
There is 300k in the pile to loot (because there was 600k when the castle was taken to get tier6 treasures), the 6 members start harvesting, they take 6k each 5 second off the pile, it take a total of 250 second of harvesting time by the whole team to take out the gold.
Example2 (the extreme side): There is 10 people coming to take out this castle. They know they need to be alot since there is 500k gold in that pile, they guess the defense will also be high.
With 10 person, 10k/5sec. It still take 250 seconds to drain out the whole pile, but they will get interupted there and then, and some people will be able to be sneaky enough to harvest.

Once the pile of gold is drained out, the result get in. Each person guild name get a point for each 1k taken from the pile of gold, once compiled, the winning guild take the castle instantly and the 1 hour timer goes out for this map.

Specification about the scenes:
Castle defense map is fully multiplayer. Loot is fully disabled. The pile of gold and owning the castle is the treasure.
The pile of gold inside the treasure room can be mouse hovered by anyone at any time to see the value of the pile.
Only in the allowed castle defense war time it will be harvestable by people other than the guild owning the castle.
The guild name and points are saved in the game room state between peers, such as (CD=>X=>1) where CD mean castle defense and X is guild name or a ID and 1 is the number of points total.
Each time a members of the guild which is officer or leader rank enter the castle he is able to see if the chest is lootable or not and loot it if it is.
(should be reset at midnight every night BUT not in the day before the castle defense. Lets say Castle defense is friday, thursday midnight there will be no chest spawned)
A note should also be left on the chest for that week of who looted chests. (Treasure will be separated by who ever loot it within their guild, its up to them to be honest and fair to their own!)
Castle should all look the same, an entrance, a long and large corridor with stairs going up and down visible within the piece (like rotunda stairs) and a treasure room large enough for the fighting with obstacle and all.
There is 2 ankh. At entrance of the map, and one inside the castle. Once the ennemy get in, the deads defender will get out to assemble and get back in to counter attack. Or if not too much overwhelmed they could res back in which give them a chance to defend better.
1 castle by guild

An extra:
For an extra cost of gold or coto (or both), which could be set any time during the week, you can hire mercenaries (either kobold or elves) that will fight along with your guild to defend the castle during the castle defense war time.
There could be tiers of mercenaries depending of how much is being spent.