Ok. Let’s return to the front mudguard. After I finished hammering it was time for initial cutting, sandpapering , ends’ rounding and side edges’ aligning. To simplify the job I sandpapered outer (face) side of fender, but I left its inner surface untouched, so it still has central line which I scratched on it when mudguard was mere flat sheet of aluminum.
This central line helps to keep fender symmetrical, whenever you round its ends or align side edges. And talking about side edges: the simplest method to grind them on flat surface controlling with calipers and right angle tool.
And also some mount plates which are still in the progress. It would be tricky to keep all parts properly aligned during process of welding, however I assume this design of fender mount would worth efforts: