Year 3 is now complete for team 1! Behold as the aspirations of nearly twenty masons condense into the first third of the bridge.
http://www.2shared.com/file/2796362/331b5be8/Canyon-region-year4.html Progress has been steady in spite of small fumbles, dwarves walling themselves in, a zombie cougar leaving one worker bedridden for a month and one of the dogs bleeding to death after a skeletal wolf attack. The second and third tower are nearly-complete; with luck, the next three towers will be completed next year.
My goals appear to have been set ridiculously high, given the small number of masons in my team's employ. Only a total of 2,500 blocks have been set this year, which prompts me to consider that it will take at least 30 masons, and most likely 50, to complete the bridge in seven years. Food and drink stores are, however, plentiful, so very few additional farmers will need to be put to work next year. I hope we get at least a population of 70 by spring.
I strongly suggest that the next wave of immigrants be almost entirely turned into masons. If a few weavers, clothiers and leatherworkers show up, I suggest you leave them to their professions; clothes are starting to get torn up, and will need to be replaced. Ignore the need for a military so long as the original soldiers and dogs can safely repel undead animals.
Magnetite was found, along with a large vein of lignite; no platinum or gold yet. Perhaps these ought to be sought out in order to attract more immigrants, though not at the expense of the construction project.
Valdemar, you're welcome to build the next several towers as you like. I suggest, however, that for symmetry reasons, the bridge's northernmost tower should look identical to the southernmost one, and so on. I also encourage you to consider the cost, in time and resources, for building each tower before you decide on its architecture, and to draw that architecture in a spreadsheet program before you incorporate it. Having used spreadsheets myself for this game year, I've found they really help for optimizing room layouts.
I've drawn an Open Office spreadsheet of the 3rd tower's schematics; you might want to use it for finishing the 3rd tower. here it is: http://www.megaupload.com/?d=2Z9GNYQD
Also note that I built the forge and a few furnaces under the old southern caves; these buildings might as well be relocated.