Here is my own attempt to convert a figure to represent Alpharius when he has revealed his presence. The weapons are magnetised so he can swiftly be converted to a praetor when (if) FW release an official sculpt.
I'm quite pleased with the helmet - scratch built with the earpieces and breathing hoses from a regular helmet. Some of the scales went a little awry though.
Next step is to add a short cape and then paint.