In your view is the Third Heaven a physical place or a metaphor?
Oh, it is a place for sure. King Jesus is in a physical body that was raised from the dead, and that body is sitting on a physical seat.
Angels though invisible pick up physical people and transport them, or move them, or protect them physically.
The Lord Jesus rose in a physical body and proved it to the disciples by eating fish in front of them, yet also didn't need a door and appeared inside the building without using a door. He also told Thomas to "touch" his side, meaning it was physical and tangible. (John 20:27)
Luke 24:36-43
36Now as they said these things, Jesus Himself stood in the midst of them, and said to them, “Peace to you.”
37But they were terrified and frightened, and supposed they had seen a spirit.
38And He said to them, “Why are you troubled? And why do doubts arise in your hearts?
39Behold My hands and My feet, that it is I Myself. Handle Me and see, for a spirit does not have flesh and bones as you see I have.”
40When He had said this, He showed them His hands and His feet.
41But while they still did not believe for joy, and marveled, He said to them, “Have you any food here?”
42So they gave Him a piece of a broiled fish and some honeycomb.
43And He took
it and ate in their presence.
He also left the Earth in His physical body in front of everyone meaning He didn't evaporate or vanish into thin air. (Acts 1:9)
Seems to me the physical nature of God's realm above sort of aligns with the physical reality of a literal Adam and Eve like is mentioned in the OP.
Real people, real places, real interactions. Yes, I believe thoroughly and without reservations it is a tangible place where people sit, stand, walk, talk, and interact just like here, and I have heard no accounts that were Biblical to suggest otherwise personally.
Do you differ in opinion?