Thanks for the input, guys!
ClearCaseMan, I think one of the endos from T1 is on display in Japan.
Crawjaw, yes it's very cheap to build with but it takes a lot of effort to get the finish I'm after!
I know, the silicone and resin is quite expensive, but I'll have the opportunity to produce more than one endo that way, and possibly, sell parts!
Here's a small update,
I'm still tinkering away with the skull. Focusing on refining and getting the lines in the face as "smooth" as possible.
I'm also doing some work on the bottom of the skull, where the jaw will attach.
I know, it looks like a mess underneath, but I'll smooth things out soon!
I have also been outlining some of the details on the chest.
My fellow endobuilder Jaz was awesome enough to send me a genuine replacement for the "chest emblem" that I will use instead of the scratch built part that you see in the picture above. Thanks Jaz!