Although you may not have a Rx-78 HG gundam, do you know any HG Rx-78 models which have all the accessories like gundam hammer, gundam javalin, beam sabers, gun, cannon/rocket launcher and the core fight gimmick?
Something similar to you MG version of your RX-78 but a HG model.
Currently, the HG 1/144 Wing Zero Custom Gundam isn’t really that good of a model due to how old it is.
I noticed recently how the HG Seed gundams are getting a remastering, so I think the Hg Wing may get a similar treatment.
I checked other reviews on the Hg Wing zero custom, it can be displayed well but it articulation isn’t that good.