Hi Guitango, I’m happy to see you’re kit out together and I’m glad you are enjoying it!
For the fifth string alignment, there could be a few causes and a few fixes.
First, the peg hole might have been drilled slightly inside of where it should ideally belong. That would be my fault, it happens and hey, $150 kit as opposed to $350 so I didn’t spend a lot of time on precision.
Next thing to consider: the nut and bridge spacing. If you bring the nut string spacing in slightly it could open up some space between the 4th and 5th string and get much closer to equal spacing.
Third consideration: the tailpiece could be shifted over to the right about 1/8” and this would also get that spacing more uniform.
Fourth consideration, if your homemade nut and bridge spacing is different (wider) than mine then it could be contributing.
I’m looking at the other customer submitted photo above and see there is a little bit of a string spacing issue but it’s not quite as noticeable as on your banjo. Every banjo is handmade and I hope these little quirks are more charming than annoying.
I hope you continue to enjoy your kit regardless and I’m glad you provided your feedback here for things I can improve in the future.