I have done two plank builds with someone else inletting the barrel and drilling the ramrod hole, I would recommend this as a starting point over any precarve kit out there.
I have done two precarve "kits", one was mildly flawed, one was a nightmare with at least ten major flaws in the way the precarve was cut. I will NEVER do another precarve kit.
I put together one Kibler SMR, it was an early one with a Rice barrel and Chambers lock, the inlets were slightly undersized, it took more work than the current ones but was still a breeze to assemble.
So, my recommendation if you want to learn to build a rifle start by assembling parts for the style of rifle you want, buy a stock blank and have one of the guys who do really good work inlet the barrel and drill the ramrod hole for you and proceed. I use full sized plans to work off, keep in mind your parts and the parts on the plan may be different, so you have to adjust your parts to the plan. I found this out on my first build, I put my lock exactly where the plans indicated, the sear position on the plan and my lock were vastly different. If I had already cut for my buttplate and didn't have any extra wood I would have had a 12" length of pull, thank goodness I left some extra wood on the blank
If you want to just get your toes wet as far as gun building goes to see what it is like, get a Kibler, bar none the best gun out there for those who have minimal skills and just want a fine gun.