Interesting designs. But they are quite vulnerable, especially when the terrain doesn't allow the complete digging of the moat. But still with fitting terrain it is easy for enemies to severely damage Saladin's economy as most of his buildings are outside his fortifications.
Just some slaves (maybe 20-30) are necessary to set the outside buildings of castle 1 and 4 on fire.
Apart from that, attacks with relatively small groups of horse archers, catapults or melee troops may also sufficient to crumble Saladin's economy.
In three of the castles you used killing pits, but (except the first one with the killing pits around the fire ballistae) they are nearly useless as they are do not protect central points of the castle and thus are not often approached by the enemy.
Moreover, you use no pitch - a defensive measure that would greatly help Saladin fend off especially slow, heavily armoured troops that need many, many arrows to kill.
The placement of some of the good things may also be a bit troublesome as they are placed extremely far away from stockpile and granary. This is important because the citizens of Saladin's castle will travel all the way to the good things regularly, which can slow down his economy quite much.
By the way I think there are a bit too many hovels in the castle of the fourth picture.
So, with many un- or only slightly protected buildings and without pitch and strategic placed killing pits, Saladin's economy may be not really that great. With a big industry, he would have the money to build a heavily fortified fortress, but without proper defenses his industry may not last for long.
If you have SHC Extreme / Warchest Edition, you may know the Wazir. Some of his castles are surrounded by really "nice" pieces of pitch, moat and killing pits. Putting such around your castles would be great.
But don't misunderstand me, the castles are not all bad! I like the front towers of castles 1, 2, 4 that make an assault from the front side quite difficult for any invaders. Moreover, you use killing pits to protect the fire ballistae in castle 1. Furthermore, you put good things right inside along the moat (especially in castle 2), putting up an additional, un-burn-able barrier.
And somehow, I like your method of combining moat and gates... though, adding drawbridges and walls may really strengthen Saladin!
Oh and you should really add some stairs inside the castles, or otherwise he is trapped and can't access his own towers anymore! During a (longer) siege, this can be the decisive and mean death for Saladin.
And did you ever think of adding boiling oil to Saladin's defenses? One or two of those little hot pots in the hands of engineers on top of his keep may work wonders (but don't forget to place an oil smelter)!