The scaffolding hardware we bought at Home Depot. It was ~$330 for (2 of everything) pump jacks,ground anchors,workbench/guardrail holder, and six braces. The uprights are 20' long 2x4 (actually a 2x8 ripped to width) and the walk surface is 2x10x16' undressed staging planks. Each upright is 2 2x4s nailed together. To make it square you could add a strip of 1/2" plywood in the middle, but it's not absolutely necessary. We then attached one set of braces at about 5' and another at 15' on the uprights. Stood them up,planted the foot, check for plumb and nailed the lower braces to the house. I then went up the ladder for the uppers. I eventually had to put a step ladder on the work platform to reach high enough to attach the upper braces just below the soffit. This step was (if you'll pardon the pun) the height of sketchiness. Trying to balance on the ladder which is on two planks while nailing is not for the faint of heart. With the top ones in place I removed the middle ones, and lowered the bottom ones af far as I could, to get full run of the wall. As for working over the porch roof, that's something I have to figure out myself. The guy at HD suggested nailing a joist hanger to the roof and attaching the upright to that. I own an arc welder,so I've been thinking about fabricating a foot plate with angled socket to match my rook slope, then nail that to the roof much like a roof jack. For the driveway side where we have to reach the peak from the ground, I'll have to splice in more 2x4 to my uprights.