The construction will not be just for decoration, but play a major role when you have to defend your fief against an attacker. Medieval Engineers would offer the possibility to build castles and towns on the map and in the world of MBWB, as soon as you become a vassal or a lord of your own with rights to do so. I will describe my dream further as I first published the idea on Facebook some weeks ago. Maybe this could be done by mod, or just merging the projects. Honestly, I don't know how this could be done or if developers on both shores of the river embrace this idea or not, as being willing to build a bridge later to make a dream of happy marriage come true. I am really in love with the idea of mixing Medieval Engineers and the existing game 'Mount & Blade Warband' together, which you with an interest in medieval things certainly know and play.
