Ya, the long ones have to be used carefully. I have a bunch it the t-bar clamps but I don't really like them because they force a pretty wide gap between pieces. I have trouble getting good tacks with that wide a gap and I find it hard to feel the alignment. I guess nothing is perfect but they all have their uses in certain situations. I still have a lot to learn about it all, that's for sure.
Willowbilly, looks like I don't need that drip rail piece afterall! I had enough left over from the good piece.