I had a quick play at creating some building in B4. While there is a large variety of things you can build and things to build with -as well as massive flexibility in how to alter the pre existing objects or "building blocks", it remains quite fiddly and complicated to locate and place objects in relation to each other. This goes for something as simple as placing a roof ON a building as it does lining up walls with gateways and towers around the circumference of a Castle.
What is desperately needed, if tile creation is to be accessible, speedy and creative, is some sort of "object snap" (Autocad term) or, as in Galciv's ship builder, "connector nodes" on which building or other parts can be placed in relation to each other.
In galciv this meant it was easy to place guns on a ship's wings, symetricaly or however favoured. Otherwise, the task of placing any objects in relation to each other will remain a bit of a chore...
Yes there may be a trade off in absolute creativity, forcing the player to use existing "nodes", but perhaps they could be optional (default ON!) to truly unlock the potential for player generated content.