This is an awesome thread, here are my suggestions:
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Place-able idols, statues for all gods (like the snake idol and ymir statue that is in game right now)
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I know mounts were cut, but would you consider a mount that only moves as fast as a person who is sprinting but the stamina of the mount last much much longer than a persons. This would mean that you do not have the issue of high speed mounts and people could cover vast distances easier.
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Banners / carpets / tapestries for each of the gods
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A trophy for each type of dragon (even the bone dragon)
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A larger door and door frame, something two walls high and two walls wide. One for each building tier. Sometimes the gate is just too big and the single door falls too small
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A portcullis that can be lowered or raised allowing players to build a kind of gatehouse
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Additional tiers of drawbridges
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Swing bridges that could extend to any distance in the same way that the elevators do
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A siege platform that does not have the legs/stairs attached so it can be nicely placed on ceiling tiles on your base
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Expanding the map room to support clan members being able to move between map rooms placed in their clan members bases. This would ideally require some kind of consumable that would be consumed each time you use this function.