I like those loops for several reasons. They don't require any welding. There's no drilling. They can be unbolted. - And they're more compact than ones that tie all the way across the bottom of the car. The only thing that might be a negative is that the loop portion is a continuous circle that doesn't split. That would mean that the driveshaft needs to be fed through it instead of going straight up.
My eyes seem to need more light than they used to in order for me to see what I'm welding. I run the lightest lenses I can get. The cross-member was a piece of cake because it was heavier and I did it standing up under the lights. Laying down on the floor inside the car welding that thin stuff wasn't any fun at all.
