Picked up an Extreme Carnivean (abbreviated to EC) at Lock and Load for the express purpose of making it into Proteus. I never liked the way the Proteus model hung off the front of the base, but the upright pose of the EC fixes those problems (instead, its giant claws hang off the sides of the base where they cause fewer problems :P )
The Proteus kit is basically a new head for the plastic Legion heavy. The top of the head of the EC is sculpted into the body, so a simple headswap was out of the question (scale problems notwithstanding.) Since the underside of the EC's head was basically hollow, though, I decided to cut the bony parts off the top of the Proteus head and shave it down until it fit into the EC's head cavity. With that done the conversion would be essentially complete.
Here's what I have done to this point. I finally got the Proteus head pared down enough to get it to fit in. After some gap-filling with green stuff and some minor cosmetic work, the head is in!
It still overhangs the base a bit, but the tentacles are hanging down instead of projecting out and the height of the model makes a difference as well.
Closer look at the work. I made the discs at the back of the jaw larger so they'd look better with the larger EC head. Added a scale to the underside of the neck to hide some gap-filling. The corner plate on the head that I've greenstuffed on was originally on the model, but I clipped it off to get the head in. I probably could have left it and worked around it, but no biggie to put it back on.
Other side. I think the amount of space between the nose of the EC head and the tentacles bothers me. I'll probably do some work tomorrow to make it look like it all attaches a bit more.
Tomorrow I finish assembling the body (a lot of today was spent drilling pin holes.) I plan to put a crest on top of the EC's head like the one Proteus has; aside from that, I'm wondering if I want to add some little tentacles here and there on the body. There are some good places to put those on the backs of the hands and such; I know the regular Proteus model only has face tentacles, but I think adding a few on the body would make it look more... protean? I'd appreciate some thoughts on that.
I'll upload pictures as I finish assembly and (hopefully!) get it painted. Thanks for looking!