I know nothing of the company that made those parts. If you have all the parts that are needed, why not just go ahead and build it? Yea, there is more metal work compared to a longrifle build, but what you will learn on this build can help on other rifles. I'm building a hawken rifle now myself, the riveting the rib and soldering the pipes is different then what I'm used to, I find it interesting learning these new facets of building. I'd just go for it, there's lots of info in "searches" and you can always post questions.