Structures and combat

[SailorLovins]

Hello everyone. Other than what is provided in the core rulebooks (which isn't much) can someone point me to some resources that cover building, maintaining and using structures? I am designing a module where players can build structures. For example the players find a beat up ruined castle and want to begin repairs. How long would it take to repair one of the walls? What about one of the castle turrets? Also I am making rules on different features of these structures such as weapon mounts on a castle tower (Turret) or a magic mirror of sorts in the guard tower that allows the looker to ""zoom" in on distant targets. I also intend to empower the morale rules. Players can build structures to improve morale so that skirmishes will go more in their favor. Example structures could be improved barracks, amphitheater, etc. Thank you for your help.

[Zacchaeus]

As you say there isn't much. the 5e compatible module Kingdoms available in the store (https://www.fantasygrounds.com/store/product.xcp?id=LGFG5EKINGDOMS) goes into this kind of thing in pretty much exhaustive detail

[JohnD]

The AD&D DMG has a lot of information about some of this stuff.

[LordEntrails]

3E had the Stronghold Builders Guidebook (I think?) There have been other too. Not sure updating any of them to 5E is needed, except maybe damage threshold and hit points and the 5E DMG has that info right?

[damned]

There are many rules and supplements and guides for older versions which could be adapted to 5e.

[El Condoro]

Matt Colville has (extremely successfully) funded this project: Strongholds and Streaming (https://www.kickstarter.com/projects/255133215/strongholds-and-streaming).