Hello! So, no problem. I will do this using Unity3d + Vuforia Engine. Or, if you need to use markerless AR, I will use ARkit or ARcore. Do you need it for iOS or for Android? You can contact me here, or in skype: altodor442.
I will send you builds almost everyday, so you could direct the work. Do you have 3d models of sculptures to show? And do you have some document about the app needed characteristics?