Preserve postman Maillard garden

My friend Mr Maillard passed away October 6th. He was a man someone could have tell eccentric but first a self-made artist. He has realized a spatially arranged set of sculptures made of stones and cement. You could have a brief look on jardin-du-factor-maillard

I am considering a project to keep a trace of this artwork (located near Cergy) trough 3D digitalization. This must be done very quickly since the site is coming to destruction in the next months. Basically, some photos could be a start I could manage but I am looking on a solution based on 3D scan. I guess I could get necessary authorizations without problem.

Thank you for your help and feedbacks!