Looking at the Caps website and customers rides, I'm sure I recognise a few cars that are on there. Mine is one of them. I've ordered the parts but haven't fitted them yet. I got the uppers from Mancinis but the dynamic struts and tie rod adjusters from Ray.
I also bought them before I saw this thread. I'm pretty confident that they'll be up to the job, going off the positive testamonials on here. I don't plan on driving into the kerb either but these things happen.
I will be keeping an eye on things but I would have done that with anyones stuff.
Just my

I've done a quick google and as far as I can tell, Drawn Over Mandrel steel tubing does indeed have a welded seam.