Building a pair of new MKIVs and need some help

I posted this over on DIYTube a couple weeks ago but that forum is unfortunately in deep cryo-stasis now that Shannon has retired from offering boards. I was gathering parts for a pair of MKIVs, I first asked VTA but they aren't offering MKIV boards currently. I was very fortunate to get a pair of Poseidon boards that Tom McNally had spare. Now, between the Poseidon board and the Classic Valve Cap board, I'm a bit confused about how things are configured as the documentation on the cap board is a little nebulous (at least for a non-engineer).

Here's the schematic and images for the Poseidon: Poseidon Manual

This is the Cap board and schematic:






These are the two transformers:






...and this is what I have so far:





So some questions regarding the cap board:

1. Would the "rectifier output" connection be pin 8 on the 5AR4?

2. Assuming "power ground output" means the black wire on the A-470? ... would this also be run to the negative speaker terminal?

3. For Transformer Bias Tap, would that be Red/Black on the PA-135?

4. For Transformer Center tap, would that be red/yellow on the PA-135?

5. Where do eyelet #6 and #8 correspond on the Poseiden?

Sorry for all the rudimentary questions. While I can make assumptions, I want to ensure everything is exactly correct and consulting the experts is always important!

if you look at a Dynaco MK4 schematic you will see where eyelets 6 and 8 are, but those are on the original Dyna board, NOT on the new Poseidan board, so they wouldn't be used in your case.