Hi Kendras,
I am pretty sure that during my searches in the subsim forums I stumbled upon a number of mods porting SH5 units to SHIII and IV, though I cannot point you to any download link. Maybe someone else will.
More in general, even SH5 units will hardly feature half the detail sported by the model in your picture. You have to understand that such an high-poly models are only suitable for rendering purposes, or for the film industry, but not for videogaming niche, where the rendering of many objects on average computers, in real time and at a decent frame rate, takes the priority.