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It's been shown in the ZERO and ZX storylines that Cyber-Elf entities from deceased Repliroids have the capability to project themselves differently to their original Earthly bodies (X and Giro). This does not segregate them much from any other varieties of Cyber-Elf, as they too can assume a basic form and even evolve. All of this is possible as long as they have the energy to keep themselves alive, which is presumably drawn from either Cyberspace, or from themselves when in Realspace.

Consider the fact that X's appearance of himself and self-worth/values could change, from fighting for peace to sacrificing himself to keep the Dark Elf in the Tree of Life ~Yggdrasil~, to awaiting for ZERO to awaken and save the world in his stead. The artwork depiction of X bonded inside Yggdrasil is essentially most of what we've seen in his struggles against Sigma and other Irregulars, as well as the effects of his involvement in the Elf Wars etc. Creating paradise in the form of Arcadia he freed himself, ironically by binding himself, and became at peace. With years and years of time presumably drifting in Cyberspace, it could be assumed that he reached his present appearance.

(...)
There is art with the 4 guardians standing around a mountain with X at the top. His back is facing the viewer and he is cyber, but his image seems to be his original body. I wish I could see it larger.

The artwork with the Big4 and X on the mountain, as sourced in canon resources, was not involved in any part of the story's lineage. It was only artwork, a mere interpretation of anything and everything.

Crazy Code Geass antics... finished the second half of Suzaku of the Counterattack volume 2, started Nightmare of Nunnally volume 3.
I was in for a shock when buying that NoN volume, when I found that Bandai Entertainment (and all the other publishers) raised their prices on new volumes!!

4th gen already? Hot damn.
I hope that you'll do a set of twins for this lot, DWII.