Finished building the first veterans of the long war

Hi there, I started working on a small Night Lords force and really wanted to bring out the not so chaotic nature of some warbands. They should be ancient warriors, raiding the realspace since 10.000 years, picking together parts and guns when they find them. Will heavily incorporate traitor guard elements so wanted them to look as brutally abhuman/large as possible compared to regular guardsman.

Legs are from the tartaros terminators, upper bodies primaris marines, arms primaris too. Guns and heads either MK3 or 4 marines boxes.

Would you allow those marines as proxies for regular ones in your games? Or are they too big?