I have been working with a guy that does 3D modeling and some rapid prototyping. I had him make a couple arms and a new Trident. I had an idea to make the Mark 1A1 fiend a base model for some conversions. Since he is a multipart and slightly more dynamic model (unlike the single piece Mark 1) he makes a good candidate.
Idea 1 - convert him to a regular Mark 1 with a more imposing trident and an arm that will support a scratch built Plasma X weapon. I have been working on some conversions but the "bio" parts of the NapalmX are tough.
Idea 2 -- convert a Mark 1 with two "Close Combat" weapons or different combinations of weapons. Essentially you could use the arms and scratch build weapons or even use other weapons that are already out there.
I will keep you updated once I have them in my hand.