First of it is the Hi-Nu (Hi-V) Gundam from the novel beltorchika's child. Just because I am unsure what have you done to customise it apart from panel line the kit? It looks painted but that could just be a gloss top coat.
This is actually 1/144, just to the right scale. This is the Model Comprehend Hi Nu Gundoom, a HG 1/144 designed to be the plastic version of a resin kit. It's quite good, though I question as to if some of those pics are yours, the box pictured is not the one that this kit has, the energy wings were in a special edition box that doesn't even look close to that one.
There is a 1/100 plastic version of the VP Hi Nu floating around. I thought this was might be it. But it is indeed the 1/144. My bad
This isn't Bandai, so it may not say MG or HG or RG or PG anyway. If it was Bandai, yeah it would be pretty clear, but yeah, it's HG
They used the Bandai Hi Nu mold and mixed it with the VP conversion, I was just curious if they used the internals from the Bandai kit or not.
You're thinking of the MG HiNu EVO from GoGo, which indeed uses the inner frame from the Bandai MG. Once again, this is a 1/144 plastic kit designed in plastic from a resin kit. This is done by Model Comprehend.