I'm currently at the stage where I have a locally hosted server to put the finishing touches on this in. I generated 1024x512 blocks (2048 chunks according to MCEdit) and then copied, rotated 180 and pasted. The center has a gutter of bedrock filling in 3 tiles from each side (6 across) and 64 high; the 64 above that are empty air. In the middle are two chests.
It looks like everything that doesn't have to think got copied correctly. Unfortunately it seems that rubber trees might need some extra data for the sap-holes; I'm planning on adding these things to the chests, but want some feedback before I customize that.
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* Each person starts with a SINGLE diamond pickaxe, a SINGLE diamond axe and a SINGLE diamond shovel.
* Each person also starts with 10 personal safes (or 20 chests if personal safe isn't available), a Generator, a macerator, a stack of logs and 4 stacks of glowstone. Nothing more, the rest has to be manually harvested and crafted. (The reason for the starting resources is to even out the extreme starting point "grind" and the fact that starting out can fluctuate wildly in time taken to get set up intially. Glowstone is added because going to the nether is very much beside the point of this test.
* The map has a trench dug from sky to bedrock that is 16 blocks wide to prevent any accidental digging across borders.
10 - personal safe
256 - Glowstone dust
64 - Wood
64 - Charcoal
32 - sticky sap
8 - rubber-tree saplings
1 - diamond pickaxe
1 - diamond shovel
1 - Iron axe
1 - Iron hoe
1 - diamond sword (I think mobs should be on, but don't want luck of the draw in facing them to be a factor in this)
2 - empty buckets
4 - slices of watermellon (I'm not sure what sections of mines exist within it; so initial jumpstart bonus)
If you want machines there's enough stuff in this chest to make them, but I won't force a specific set.
32 tin ore
32 copper ore
32 iron ore
If I give -any- tech I'd want to skip directly to having all of the basic elements in play (to remove bias of favoring one process or another over the world's features); otherwise you should be making runs down to bedrock to grab initial supplies and proceeding from there.
Edit: Inventory, revision #4.
PS. Sorry for getting tripped up on the details last night; yes you did note that, however it slipped my mind in a quick reply.