The DMT experience will change over time. It will continually defy your expectations of what you believe of both the DMT experience as well as of consensual reality. I can relate to your experience though. Out of no where one day, the experience began externalizing itself to a great extent. I actually recall the first time this happened, I too was face to face with this very bright neon green energy. I believe I described it as almost radioactive looking. The report is probably somewhere on the Nexus.
Anyway, I've also had pyramids in my external surroundings as well as these twin Egyptian guardian statues. It can be really baffling to have things of that nature seemingly outside of you to interact with its environment and you, but I really covet moments like that. I'm not quite sure what you're describing either, but we're all in the mystery together.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb