So I've manager to land a job back on a cnc lathe and naturally I'm thinking of all the shit I can make for myself

Who has had experience with making their own adjustable panhard rods? Slee Offroad do a kit but I can make my own for the cost of not a lot, where would I stand legally with welding the adjusting parts in?
I get confused whenever I read LVVTA stuff so I was wondering if any one has done it before?
Cheers,
Andrew