Altair 8800 restore details - Model B PSU & case details

Trying to suss-out the details of 8800B PSU layout and case assembly. So far I've only come across one user-created image of an Altair 8800B PSU, see link below. I'm looking for additional images, from different angles - and in particular, a couple pics of the 8800B case from the _rear_ so I can get an idea of what kind of perforated metal was used to cover the fan cut-out. The linked pic shows something back there, but it looks way too restrictive of airflow and I don't think it's original. IIRC, there is one image out there that shows a round-hole perforated metal in that location, as well as covering the connector slots - but I've been unable to locate it. As ever, any MITS official documentation on the 8800B assembly process, PSU in particular, and any associated engineering drawings would be much appreciated. The A model is well-documented, but I can't find scratch on the B version, which is substantially different in several areas. The B models _were_ sold as kits, weren't they? If so, then there is or at least was a manual..