Yeah you should find a way to make the waist a bit longer, maybe use a vahki waist and a metru chest, and the MOC seems a bit messy but that could be the lighting.
The model is pretty messy. The back is clustered with the 2015 gearbox, the crotch section is blocky the red and blue pins make it worst, and the leg could of been better. Other than that, the moc is alright.
The functions are cool but the MOC is really messy. I’d also recommend trying something different for the waist. Maybe use a different armor in the thighs as well? I really like that sword though.