Unfortunately I do not have access to a workshop either, so making it myself won't be an option. I am leaning towards Woodchuck - I have seen plenty of his work. I'm thinking of approaching him to make the K-11 and the long arms for me as well.
I did also consider 3D printing. The problem is that I found that not many guys out there do it cheaply. Id also be a bit worried about its durability over the long term. I like your suggestions though.
Im going to cover off in much more detail on the weapons and give them a break down similar to my first post. After that I'll do a breakdown of my parts list which will state who I have got parts from and who I intend to ask for parts.