Well I think to do this with the Lurker of SC2:
Remove the torso and the head of the Lurker SC2 and add the Hydralisk torso and head (Maver already do this)
The skin must be more darker
Remove the membranea
Add spikes in the hydralisk crest and a grey horn
Remove some spikes of the arms
The weird membranes should definitely be removed yeah,
The weird membranes should definitely be removed yeah,
Honestly just look at the sc1 sprite and portrait, obviously there's tons of bs that didn't make it into the final design.
Original lurker portrait with no unicorn horn: http://t6ak.roblox.com/993ada9b282e414632ba1c8c9b891791