A few notes based on my current game (2.5 years in):
Blood is over-valued. I'd suggest making it 250 per barrel like grog. Meat is just too easy in this DF version. I have 350k bonemold tokens at this point and have been spending some on raiding too. Most of it came from blood. And I have made 100 bloodsteel too.
The dwarf labor cell says "mine for ore" but seems to produce stone. Is there a lowish chance of ore? Or is description wrong? I'm okay with mostly stone, but if that's the case should be some description adjustment.
Bonemold is still referred to by its old name in some places. Menu in Tribal Wargear is one I spotter. The product is correct, the text in the building is wrong.
Corsairs are scarce for me. Pop 57, 0 corsairs. Probably bad luck. Would love a way to recruit or train them though. I'd trade my two dreamwalkers for one corsair! (I am in the magic return camp.)
Update:
Spring of 4th year, elf ambush! Yay! My 4-orc guard charged out and killed 6 lickety split. Two are running. I pulled the guard back in case there are more ambush squads around. Also found out an archer can't shoot a bow one-handed (who would'a thunk?) So that one goes back into the general work force.
The guard squad was mostly in laminated leather with half claws and half swords. Two of them have some 20 level skills, the others are more like 5.
Also had a megabeast come. I had a large white tigerman merchant convoy about to leave. When they did it attacked them and died pretty fast. I tried to shoot at it from my shooting platforms, but my one-armed archer just wasn't up to drawing his bow with his fangs.
Another thought on the blood trade... might make more sense to leave the price as is and make the ratio of meat to blood when making it 1/4 what it is now. That would make bloodsteel a little tougher, but that seem okay to me. Raiding gets good metal pretty easily if the mines aren't producing any, and there is plenty in junk from merchants too... not to mention the bazaar sells steel. Don't need much to make a viable early military that can capture junk to melt down.
Screenie:
Gashamaat Duum (Valley of Doom)
http://imgur.com/oaR5VqyBedrooms stack up 4 floors above (80 regular so far and a throne suite and 4 noble suites). Great hall is two stories. Right part of gate is short path for incoming trouble. One cages is growler squigs, the other is about 30 war wolves, so far. Shooting platforms in NE and NW corners, and above gate. Great mines: limonite, native gold, bituminous coal and galena (both silver and lead for later ammo production.) Also a smattering of native platinum. Biomes are wilderness and untamed wilds, temperate to warm. Does freeze most of the rivers in winter, but that south well stays open... blew my central well design, it freezes because I let light in. Should have put it one level down.