Today was a learning curve (pun intended). The way Vans tells you to bend these has always seemed more than a little crude (clamp in a vice and hit with a hammer), so I got a set of buller bending dies from somebody on VAF. They worked great, and I highly recommend them! Basically, I just followed the instructions that came with them and they worked as advertised. Did about 3-4 passes going 1/2 turn on the vice handle at each 1" mark and then fitnesses individual areas for final fit to the template. I will say, that once you start bending, there is a tendency for the longeron to want to twist, due to gravity. A helper or two to hold up the ends would have made this go a lot faster, but it was just me, so I spent a lot of time rolling tool boxes around or stacking stuff up of bar stools or whatever to support the ends. Afterward, I taped a couple of pieces of .032 scrap together and clamped to the longeron so the the F-721 would have the appropriate overhang. Then match drilled the F-721 aft decks to the longerons. Everything fit up fine, marks and bends lined up great. Then, issues with the sharp downward bend. Coincident with the fwd edge of the F-721 is where there's a sharp downward bend. You're done with all that curving business but, the longeron just starts going downhill at a 7* angle at that point, which allows it to match up to the edge profile of the fwd side skin. Once again, the approved manufacturing process is to put it in a vice, push in the direction you want it to go, and hit it with a mallet next to the vice to encourage it to stay there. Long story short, I'm not happy with the results. On the first one I did, I got a big gouge in the inside of the angle flange right at the bend due to one of the hardwood blocks I was padding the vise jaws with evidently being in the wrong position. Bummer! My disappointment was compounded by my underwhelming radius on the second one. I know that there's some room for error here. The plans say that the profile of the sharp bend only needs to match the side skin to within 1/4". But the radius of where this bend starts is causing a gap at the leading edge of the F-721. I know that I could probably shim this and be okay, but given that I have 2 different issues on 2 different longerons, I'm going to use a mulligan here. These longerons are nothing more than 1/8" by 3/4" structural angle. According to VAF, it's 6061-T6, but I put in an email to Vans to confirm. Once I'm sure, I'll source a few sticks of this locally here in "the airplane capitol of the world" rather that pay shipping for the 16' length I need, and have another go at this. While I was at it I went ahead and put in the 17* twist fwd of the sharp downward bend, and that's really simple. Clamp at the start of the twist, grab the other end with a crescent wrench and heave away. Measure with digital inclinometer. Done! I don't see how I can get the radius any better with the setup I currently have. (4" vise, oak hardwood blocks to pad the jaws, dead blow hammer). At least, I don't know if I can get any sort of repeatability. I either need a hammer with a smaller face, or harder jaws in my vise (but not too hard!) or something. There has to be a better way to do this, and I'm going to spend a couple of days figuring out what it is.