There are two sets of brackets for the pipes that are definitely not bolted to the frame. This is the one (with the embedded but in the back of it) that I'm mostly concerned about.
There's also a pair up top on either side of the radiator that look like they have two spot welds that could be drilled out. But this one and it's match on the other side I'm not sure about. I only have one shot at getting them in one piece so just wanted to see if someone had removed them before.