Here’s a link to a related question. The discussion centers around the H90, but with a lot of useful information that applies to Space reverb algorithms. Including input from an Eventide reverb developer.
https://www.eventideaudio.com/forums/topic/strymon-cloudburst-ensemble-effect-on-h90/
What have you been trying that got you close? Those details would help to fine-tune what you feel might be missing. Each of the Space algorithms have unique characteristics that can be exploited to emulate also any particular effect.
