I'm now quilting my 3rd string quilt with foundation. I have a quilting machine so that makes it much easier for. I also use a robotic system so again easier for me. I was worried about how to quilt the spiderweb block as it had all those seams coming together in the center so I found a pattern that would go around it instead of through it. The half blocks were no problem going through. I'm working on the diamond scrappy string right now and its a breeze to go through as I remembered not to add small strips at the ends so they wouldn't bunch up.
Someone mentioned tying which is a good alternative too.