Brifae, I have not experienced anything like the Merkaba experiences you describe. But, unlike you, I am a hopeless denzien of Malkuth, embedded in this reality. I do experience enigmatic spiritual energy whenever i am immersed in nature.
Modern physics is now only beginning to comprehend multiple dimentions falling away from adamant beliefs about everything existing only in Euclidean space. Chaotic Inflation Theory (bubble universe theory) is gaining popularity due to younger physicits pursuing new mathematical and physical ideas to mesh together and discover the TOE (theory of everything).
If our bubble reality is only one of many realtiy spheres, some other conciousness could have discovered a means to travel between spheres. I personally believe illuminated people on Terra at one time could travel in such a manner. I only dream of reaching such levels of ascension.