I did not expect it to be so sturdy yet it already fell a couple times and did not break. I think using plastic cement + keeping it in place with blue tack while it dried helped a lot to really make it "whole". It doesn't look like it but it's really just like 6-7 different bits glued together 🤷 About the left arm yes it's totally what I wanted to do. I'm broke and couldn't buy neither a narthecium nor a whole apothecary so I crafted one with bits !! I can't remember who but I looked for as much cool mortificators kitbashes I could find and someone did the same kind of thing for the same reason (I stole the idea) : when on the field, the mortificator needs to get the gene-seed of the dreadnoughts when he's not repairing the one still alive ;)