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Probably best to go with one of the simpler kits
The Lyman kits are pretty well regarded and you dont need a ton of experience to do it.
Lyman Great Plains Kits
most of the work involved is sanding, polishing and finishing. No real stock carving or in letting.
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Came here to add a +1 to this. Be sure you get the correct barrel for your intended usage. They have a roundball barrel with a 1-60 twist, AND a 1-28/32 designed for shooting conicals, Maxi-balls etc.
The 50 caliber roundball weighs in around 190 grains and is a solid deer killer. I have shot both the kit built, and the complete riifle and am very happy with them. The faster twist barrel allows you to toss a 370 grain bullet that is like a sledgehammer on deer and pigs. I had my best accuracy with the round ball and about 90-95 grains of 3F black powder. Ballistics with 190 gr ball @ around 1900-200 fps are just a little shy of a 30-30 round. Inside of 100-125 yards you should be good to go.
Great project to do with the kids if they have the temperament for it. If not well you still got yerself a damn nice rifle that gives ya a few more hunting days each year.