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.