Nah not really, the Doom 3 Vile was the size of an average person, maybe smaller because it's hunched, rather than the original tall, imposing, fast lanky Vile which I prefer (why did they make it so small, slow and cowardly in Doom3?!)The Hellion looks very good for the Archvile, it only needs to be slightly bigger, nothing that SCALE can't do.
Also, for the D3 Vile's attack, a floorhugger projectile that spawns heaps of flames everywhere and has a limited range of about 1024/2056 map units will be almost spot-on behaviour, and also a summoning attack when it raises its arms