GDKP addon design

Note: after I wrote this post, Treeston/Stolenlegacy shown us his addon that has many of the mentioned functionality, so it's maybe waste of time to start coding until he is complete and something is missing.

There are GDKP addons out there, but not one that would be a serious help to me, and not only because I introduced the 1/3-to second bidder modification. (It serves the purpose to compensate people for joining a raid where they have competitors, therefore decreasing "raid optimization" efforts, where people want to exclude anyone who can bid to "their" loot).

The time-consuming part is the bidding process itself, on the player side, not on the RL side. So let me design a GDKP addon functionality. I'm not a programmer, so I can't create the addon, but if you do (or modify your existing) I can offer the popularity of this blog to advertise your addon. So here it goes:

1. the boss died, the raid leader approach the boss. His addon reads up the loot from the boss (if it's impossible then the RL links the items to the addon's field)
2. The addon announces all loot for auction concurrently (the RL may have the option to announce manually if there is reserved loot). The announcement happens on /raid by the addon writing "[itemlink] is auctioned, nnnG minbid, mmmG minimal increment". I'd like to emphasize concurrency, so if there are 4 loot, than 4 lines of announcement appear at the same.
   
3. The raid members can bid manually by typing "[itemlink] xxxG". The addon of the raid leader accepts this bid if it's at least minimal_increment higher than last bid
4. Here comes the big move: the addon can run on the player side too. They don't have to watch the raid chat as their addon reads it for them. As soon as the RL announced the loots, little loot windows pop up showing the picture of the item, the current bid, and the name of the highest bidder (or "no bids yet"). There are three buttons next to every item. The first is "pass", if the player presses it, the loot disappears from his interface. The second is "bid minimal", the third is "bid minimal x5" (the value of the minimal increment is read from the raid chat). If the player presses either bid button, the addon writes "[itemlink] xxxG" to the raid chat. The bid buttons grey out if the player have not enough gold to bid. Since the raid chat is read and written by the addon and the players see a graphical bid interface, bidding is very fast.
5. When there were no bids for 5 seconds to an item, the RL's addon writes "[itemlink] will be sold to XXX for nnnG, you have 5 more seconds to bid". It is necessary to let those without addon to bid as the /raid is flooded by bids. If anyone bids, the addon repeats the countdown after 5 secs of the last bid. If there is no bid, it writes "[itemlink] will be sold to XXX for nnnG, you have 3 more seconds to bid" and once more at 1 second. The countdown number is flashing next to the item on the player's interface if they have the addon.
   
6. If no one bids during the whole countdown, the RL's addon writes "[itemlink] is sold to XXX for nnnG, XXX please trade me the gold (or 2/3 of the gold and 1/3 to YYY it should be selectable)" The item disappears from the interface of all players.
7. The RL interface have two panes, one is identical to the player interface, so the RL can bid. The only difference is that if he passes on an item, it does not disappear, just the bid buttons, to let him see how the bid is going. The other pane is the cumulative pane, it shows all items sold in the raid, their price and a "paid" icon that should be checked by the raid leader when the winner trades him the money. On the bottom, there is the sum value and it's /10 and /25 value.