I think I figured out what the last things I will add to tech be, here they are:
Mechanon(this may not be the final name)-a mini walker with a pick and axe combination and a bag for resources, It collects resources faster and moves faster and can also carry more then a worker, it cannot construct buildings though.
Tank-da vinci style tank with a cannon in its turret, possibly an offset ballista for anti air, spears for close up infantry, upgradeable with greek fire for more damage dealing.
Airship bomber-Heavy air unit, similar to airship but drops bombs and has a forward crossbow turret to protect itself air to air.
Wing flapper?-second generation air fighter, superior to ornithopter and has secondary chinese style rocket pod for ground attack.
mounted archer or scout-a bow armed rider with low armor and hp but high move speed and sight and moderate range and attack.
stable-building to produce knight, horseman, and mounted archer
stone tower-elite defense unit with higher armor, attack, range and a secondary stone throw attack that can be replaced with greek fire grenades with the greek fire upgrade.
New model for the crocodile, based on the da vinci tank model
new upgrades including greek fire, metal plating, masonry, steam power, rocketry, bombs, rapid fire crossbows, and recurve bows.
A hero unit, suggestions are welcome, and the knight and assault trooper will now require a special resource from the castle to produce, you will only be able to produce two knights or two assault troopers, or one of each for every castle you have, this will turn them into a special and costly unit.
Please post comments on this and the gervoriath tech tree because I really need advice.