Here's an overall picture. I have a BM3000 slide rule too, but thats connected to the computer so couldn't get in to the pictures.
BL5000 set up sitting on the 900RG Compact and being kept company by a Beolit 1000 oh and a 42v record deck.
The Penta's might not be from the right period but they go really well with the 5000.
Hopefully there's not much more I need to complete the collection. Cubes would be nice but they wouldn't get used. A BG 3000 would complete everything but they are rather hard to come by.