Is there any info available regarding the RM-8001 Dyno Bellhousing?

1) What engine bolt patterns are on the engine side flange?

2) What is the rear plate made of and how thick is it?

3) Are the bolt patterns on the engine flange centered so the crank centerline is always the same at the rear plate?

4) My dyno bolts the water brake directly to the back of the bellhousing. (Land & Sea Dyno) Is this bellhousing up to the task?

5) Or can I have a bellhousing made with the multi-pattern engine flange and the common GM trans. rear plate?

Thanks for you time. Jeff