Just keep in mind Duelist and I modified our builds, him more so than me but you don't have to. The most work involved will be rasping/filing and sanding the stock plus filing and sanding the brass ramrod pipes. The potentially most difficult will be fitting the sights, I found a triangular needle file was indispensable in this. Otherwise everything is fitted, all the holes drilled and the kit comes pre-assembled (except for the sights). Take it apart then go to work on it.
I kept this picture in front of me every time I worked on mine.
Here's my finished one.
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