Thanks for telling me. It looks like you did well in integrating the graphics! I don't have the definitive edition of AOE2 but I used to play the original game + Conquerors back in the day. I even made a graphics mod with some steampunk buildings but never finished it and unfortunately don't have the files anymore.
Viewing post in Isometric Realm - Medieval Buildings comments
Awesome. I just had to turn up the color contrast a little bit on your graphics in photoshop so they blended better with the aoe2 buildings and environment (their artstyle seems higher contrast with the colors). And I had to make the cathedral more 'compact' so it fits nicely onto the tile layout of the aoe2 monastery.
Here is another mod where I changed the dark age architecture with some of your palisades and thatched roof assets: https://www.ageofempires.com/mods/details/48645/