I've built a couple and I don't think it's based on any specific reverb pedal. It uses the FV-1 DSP chip and employs an "outside the box" thinking when it comes to setting up the patch and the fact that the FV-1 left side output is fed-back to the FV-1's right input thru a B50K "Deflect" feedback pot. It is not your standard everyday reverb. It's a verb on steroids.
It "may" be close to some commercial production pedal, but I've no idea which, if any. It's one of the coolest verbs I've built to date.