Some interesting ideas in here guys, good thinking..
If we could build a Kingdom from scratch, it'd be nice to see the Fiefs expand along a sort of Tech Tree if you will...
Hamlet -> Village -> Settlement -> Town -> City
Camp -> Outpost -> Field Fortification -> Castle (Wood) -> Castle (Stone) -> Castle (Stone Lvl 2)
The Hamlet would be simply two houses, one mill and one field
The Village would be the vanilla villages..
The Settlement is an expanded vanilla village with a few more building and a few stone walls or wooden fences around it
The Town would be the Vanilla Town
The City would be an improved Vanilla Town with more decoration in the streets to show wealthy living and prosperity
The Camp will look like the Camp when you Camp on the map, but maybe more than one tent
The Outpost will be the same as the Camp but with a small wooden Outpost Tower in the centre
The Field Fortification is the Outpost but with some ditches and a few wooden spikes and other defense's to hide behind
The Castle (Wood) is the Vanilla Wooden Castle
The Castle (Stone) is the Vanilla Stone Castle
The Castle (Stone Lvl 2) is the Vanilla Castle with more Archery Slits and defense's + training ground decor. Siege Tower only, no ladders.
I hope these are good ideas.
