One point, i heard from r shlomo cunin, that when he found the chandelier, there was no wiring in it, and he commissioned someone to install electricity.

If this chandelier was originally in 770, it would have had electricity.

From the booklet about the Rebbe’s trip to France to pick up his mother in 1947:

Yankel also introduced the Rebbe to a cousin of his that lived in Paris. Shortly after his arrival, Yankel was fundraising money at a woman named Edmée’s home, where he complimented her on the elaborate chandelier in her home.
“My grandfather made it” she replied plainly, “he was a great Chassidic Rebbe, Rebbi Shmuel of Lubavitch. He made a few of the artifacts in my home.”
Yankel nearly choked – she was referring to the Rebbe Maharash – who was famously ordered by doctors to engage in handicrafts due to his health condition. How did these precious items end up in France?
The Rebbe Maharash’s son, Reb Menachem Mendel, was a businessman in Russia. After a few foul deals, he had to leave the country settling in Corsica, a mountainous Mediterranean island in the French region. Every year or so he would return to Russia to visit his family with false papers, and it was perhaps during these visits that he imported these prized possessions.
Being an avid craftsperson himself Yankel was extremely intrigued and when the Rebbe arrived in Paris a few months later, he made the introduction between the two. She would later give the Rebbe family photos as well as a Megilas Esther written by the Rebbe Maharash himself, both of which were featured in his biography the Rebbe made, published just two weeks after his return to the states.

A year later (after the Rebbe had already returned to the United States) Edmée had found out the whereabouts of a small table that the Rebbe Maharash had made, and after tracking it down and obtaining it, it was decided that Yankel would bring it to the United States for the Rebbe. [Until this very day, this special table sits in the Rebbe’s room.]

Again, all this was on the Rebbe’s trip to France in 5707/1947 (which coincidently, he also returned on the same day then – 28 Sivan), years after the Rebbe and Rebbetzin arrived in the US with above mentioned trunk.

very interesting story though.

It is interesting to note, that in the Rebbe’s room, above the wood paneling along the top of the wall, there are also small images of faces.
This fact was not widely noticed by Chassidim until after Gimmel Tammuz because Chassidim entering the Rebbe’s room for Yechudus obviously weren’t checking out the decor.

Perhaps there is a connection with this chandelier?

This would add up with the case of the above trunk being that upon first arriving in America, the Rebbe and Rebbetzin lived in Gan Eden Haelyon (- what would later become the Rebbe’s Room) for around two weeks.

Perhaps the Rebbe had it removed?

It’s also interesting to note, that in the other 770s which have a replica of the Rebbe’s room (Ramat Shlomo Yerushalayim, Kfar Chabad, etc.) these faces remain the only detail of the room not copied.