So Cal rod Shop now does a step box on their 32 frames from what I see in the ads. If I understand correctly they started doing this to help protect the lines and also to hide them a little bit. In about another year we are going to built another 36 Pontiac and Plans right now include step boxing the entire frame, although it is plenty strong I am going to have to cut the x-member partway out and will lose some of that strengh. As far as clamps the one from Gordman are very nice, but a lot of times I use what are called adle clamps, these are manufactured for electric wiring and are made out of either stainless or aluminum and have a rubber cushion and are available in a varity of sizes. Not saying it is perfect, but it works for me.