From wikipedia
Organisation
The organization of the Iron Hands Chapter, following the Second Founding, deviated from the Codex Astartes. The Chapter drew much of its organization from the clans of Medusa. Each of the ten Clan Companies is a single entity, possessing its own command hierarchy, veterans, beliefs and traditions.
One warrior of each Clan Company is nominated to represent their peers at the Great Council of the Iron Hands. As such, there is no single Commander of the Chapter, a precaution implemented so that no one man can lead the entire Chapter astray, as happened during the Horus Heresy.
A further departure from the doctrines of the Codex Astartes is the lack of Chaplains. This position is instead filled by a Marine known as the Iron Father, who combines the roles of Chaplain and Techmarine. The Iron Father is considered the religious representative of both the Emperor and the Adeptus Mechanicus.
Combat Doctrine
The hatred the Iron Hands feel towards weakness and corruption has an effect on the Chapter's doctrine and operations, a belief that even extends to their own bodies. As a body can be injured, broken, or led into temptations of the flesh, the Iron Hands seek to eliminate any perceived fault within themselves through any means possible, usually cybernetic replacement of the body part.
The hatred of all weaknesses is harnessed and focused by the Iron Fathers for use in battle, where the Chapter will fight with renowned intensity and determination, regardless of the opponent. The bitter Marines will advance in a machine-like and relentless fashion, throwing themselves violently at the enemy.
Dreadnoughts and Terminators are rare because many of these suits and machines were lost in the Drop Site Massacre. Due to their combination of the organic and mechanic, the ones that remain are treated with great respect. Entire squads of Terminators will rarely be fielded, but the inspirational feeling they create among the rank and file is harnessed by allowing veterans equipped with Terminator armour to lead squads of Tactical Marines. For similar reasons, Dreadnoughts will lead forces when the occasion demands, and several of the Clan Companies Leaders are contained within the armoured sarcophagus of a Dreadnought.
So I think the case might be that they can't remake Dreads and Terminators because their construction is all but lost.
I don't think they would have pre-heresy armour as they would have been destroyed in the drop site massacre, so all their equipment would have been built post heresy
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