Hi reroll, here's a pic of the cast:
There's a bit of flash to clean up, but the head slots straight in and the arms have been cut so they have a decent surface area for superglue contact. You might want to pin them, but you can probably avoid it if you want. The optional axe slides into the right hand, and the knee spike plugs into the hole. Like any multi-part model, you may need to do a bit of filing to get a really neat fit, and perhaps use some putty to cover the seams, but it's pretty minimal.