If I were you seriously consider a 3 peice. Have only built one, an experiement but none the less you learn on doing different type. Right out of the gate I did not hesitate to build 3 limbs, that way if one broke, the third limb was waiting. I took maybe 25 shots and the bottom limb snaped. Luckily I had the spare limb waiting, just had to drill the holes.
Its easy to make a 3rd. limb when you have all the tools and material ready to go..! And I find that a 2 peice does not seem to stack as easily, maybe just me,? but I like the way it pulls smoothly to full draw.