The pics I took were of a friends plane. Therefore I am not sure how he did it but I will see him today at a float fly. Here is how I would do it --- draw a picture of the way I want it to be ---- measure it and add a little extra on each end to be trimmed off after the final bend is made and cut it off the bar stock. Mark on the stock where I want the first bend to be and clamp the stock in my vise. Make a bend and then take the stock out of the vise and check the bend by placing the stock on the drawing. I would brobably bend each " foot " first and then the two bends at the top . Continue making the bends and checking against the drawing.
Be careful as some models are not flat on the bottom of the fuse and one mounting bracket may end up taller than the other. The rear bracket might be a tad higher as the fuse narrows toward the tail feathers. With this in mind , if you make the two the same height you might end up with too much incidence between the wing and the top of the floats.
It is not as hard to do as you might think. Good luck ----