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Sidereal/physical Heaven was to distinguish that Heaven from the Heaven in which God dwells (which is immaterial / spiritual ... although there are mansions prepared there for those who will dwell in Heaven with physical bodies, e.g. Our Lord, Our Lady, likely St. Joseph, and eventually all the human elect).  So you're begging the question pretending that this "sideral heaven" implies the vastness of space that holds the stars.  That's not how the Church Fathers understood it.  They believed it to be solid and that the stars (smaller lights) were in it.  There were debates among the Fathers about 1) what it was made of and 2) whether the sun, moon, stars move within it vs. whether they are fixed in the firmament and the firmament as a whole moves around the earth.  And the entire debate / argument / dispute had to do with the question of how is it possible for physical objects to move within another physical object (the firmament).  Those who did not believe it possible held that the firmament itself (being solid) moved around the earth.  Others believed that the firmament was made of some kind of quasi-solid substance (similar to some kind of hard plasma) where the solid matter could be displaced the same way as happens when objects move through water, and yet it was more solid than water so that water could not pass through it (since it kept actual physical waters out from atmosphere and from flooding the earth).

So because you believe that the stars are these giant suns, you falsely equate mention of "sidereal heaven" with some vast space.  To repeat, the Jєωs and the Church Fathers believed in THREE heavens.  First Heaven was Air (where birds fly, etc.), Second Heaven was the Firmament (in which the Sun, Moon, and Stars are), and the Third Heaven was where God and the angels are.  That second was also called the Sidereal/Physical Heaven and the mention of Sideral/Physical Heaven does not mean what you try to pretend it does.

You should take a look at Tradman's response. You keep mentioning Church Fathers but he was the one that actually gave quotations. And I still don't see why a firmament can not exist in a globe model.

Thank you, Mr. Protestant, for your opinion, but Catholics understand Sacred Scripture based on the unanimous interpretation of the Church Fathers, and they unanimously believed in a physical firmament that kept physical waters above the sky from flooding the earth.

And sir, if you take a look on the context, I was replying to someone that keep saying bible verses such and such without even mentioning the interpretation. 

You should take a look at Tradman's response. You keep mentioning Church Fathers but he was the one that actually give quotations. And I still don't see why a firmament can not exist in a globe model.

I've read all these quotes and more, just didn't have time to dig them up before responding.  He supplied some of the actual quotes (there are many more).  My point was simply that your finding references to the "sidereal heaven" in the Church Fathers does not back up your reading that the firmament was not solid.

Some of the debates among the Fathers actually help illustrate what they really believed.

They all unanimously believed that the earth was at the center of the universe.  But there was a debate about how heavier matter, such as the earth, could remain suspended in the middle of the waters which surrounded it.  See, for them, they believed in density, not gravity, so they held that the earth would sink to the bottom of the water, and the world would have to be at the bottom of the waters.  St. Augustine wrote that he believed this opinion to be tenable because "bottom center" is still "center".  Others had other theories about how water vortex or water pressure or simply God willing it caused the earth to remain suspended in these waters at the center, without sinking to the bottom.  St. Ambrose was debating some group that believed that the earth was at the bottom because the vortex theory would, in their belief, cause the waters to flow down off the firmament.  So the ones who believed that the earth was suspended in the middle held that the shape of this firmament (the world) was spherical, and that this sphere moved around the earth.  Those who believed in the "center bottom" theory held that the earth was shaped like a hemisphere.  Still others held that because Sacred Scripture described the firmament to be like a tent, that it wouldn't be spherical because tents are spherical (they held that it was more cone-shaped like a tent woudl be).  This is the reference to the tabernacle (tent) of heaven.  St. Augustine responded by saying that just as leather can be shaped like a sphere (referring to a ball), so even if it were fashioned of a tent-like material, it could still be spherical.

But in ALL of this, it's simply assumed that 1) the earth is the center of the universe (possibly bottom center) and 2) that the firmament is a very real and solid thing (not a metaphor for the sky) that kept real and solid water (not a metaphor for space) out of the First Heaven, i.e. the atmosphere.

I think that Dr. Sungenis recognizes that they believed in a solid substantial firmament, and thus he developed his solid infinitely-desnse Planck fabric theory as an alternative to a "space" that his nothingness.  Interestingly, he too posits a way in which solid objects can move through this solid mesh ... similar to how some Fathers argued that solids can move through solids.