First post: Questions regarding ALTEC 612 enclosure - DIY

[Tralalalala]

Hello,

This is my first post on this Altec forum.

I am about to build myself a pair of Altec 612 enclosures for my Altec 604 E?s.

I have found a blueprint of one of the Altec 612 models on net. The blueprint is attached with my markings on it.


My questions:

1. Will I need a bass tube for the bass port in the 612 enclosure ? - or will the opening be enough in itself.
The reason why I ask is because I found a picture of the inside of a vintage Barzilay cabinet that did have a bass tube.

2. I also did find a picture of a DIY 612 enclosure that had a frame on the inside of the cabinet that is not shown completely on the Altec 612 blueprint.
Will I need to build this frame ? - if I do can someone give me a hint of how it looks like from the top view.

3. I do not get what the purpose of the wood piece that goes across inside the whole enclosure on the blueprint - could someone please explain.

4. I did also find the original blue/grey color code - but it is not possible to mix - at least not where I live. Does someone out there have a updated color code for the original blue/grey paint ?


I will appreciate all the help I can get.