The building bug bit me back in the early 90's, and I jumped in with both feet! I sent an order off to the Log Cabin Shop for a fancy curly maple stock blank, a Getz swamped, 42", .45 cal. barrel, and a lefty Siler lock. I had read the Hershel House story through and through in the Fox Fire 5 book, I had watched numerous times the Wallace Gussler video from Colonial Williamsburg, and walked around Dixon's Muzzleloader Shop and had in hand an autographed copy of Chuck Dixon's book on building a Pennsylvania longrifle. I felt I was all set!
Well, a year or so down the road, I found myself asking Chuck for a name or two of builders he could recommend to build a rifle from the above listed parts.
A couple of years later, Paul Allison called that he'd finished my left-handed copy of an Andrew Figthorn rifle! I offer this explanation simply to illustrate the dilemma I found myself in from the long rifle building bug bite!
I looked at the beautiful blank of curly maple, the 42" swamped barrel by Getz, and knew finally that hand inletting that barrel into that stock, and drilling the ram rod channel were well beyond my skill level! If there's a moral to this "story", it is this. Don't take on more than you can handle for a first time build.
After my first plunge described above, I have build a half dozen or so flintlock rifles, a flintlock pistol, and a flintlock fowler. All of these had the barrel channel 95% inletted, leaving only the breech and tang undone and the ram rod channel inletted. I found that with my "skills", work space, and old eyes, the remaining inlets were doable.
For what it's worth, I've offered this as one person's checkered flintlock gun building experience. It has been, at times, frustrating, exhausting, bloody, and over-whelming, but also, enjoyable, fulfilling, satisfying, and tear-producing when seeing the joy on my grandson's face as he held his high school graduation present and lifted it to his shoulder to peer down the barrel.
Good luck with your squirrel rifle.