Guide on adding a new model, animation, and creature to HoMMV

Hello! Could you please advise if anyone knows? I'm trying to get the model of the Haven castle in HoMM 5 (the one that is displayed during construction, not on the global map). I copied the entire Geometries folder to convert the models and open them in AccuTrans3d. However, there are many files, and I don't understand if there is a way to separate what I need from what I don't, since their names consist of a set of letters and numbers. If anyone has encountered this, please give me some ideas on how to approach this. P.S.: The model doesn't necessarily have to be a single one; it can be separated by buildings. Perhaps that would even be better.