Thanks again Gordon!
I tried the nose on using steel sheet strips and pliers. The strips makes sure the missing piece can be made with flowing lines. They should have at least 3-4cm overlap on each of the panels to be aligned, and wide enough to not be bent too easily.
I was not able to make the upper portion flow and get what I thought was a sensible slant on the grille. The bumper support tubes did not end up where they should be. On closer inspection, the right tubes have taken a hit and made some dents in the U shaped front frame. Some previous repair was made where these tubes attach to the frame. And as usual the welds looked like chickenpoop. Which made it easy to take it all out. That kind of weld lets go pretty easy. Once open, I found the whole frame filled with something appears to be excellent for planting flowers in. Although no holes, the forward facing part of the U frame looks both beaten up and crusty, so I'll make a new part. The part with a red circle around it is the support for the steering endstop.
I think you should be aware of it and where it is, so you can drill a hole above it and in the bottom of the U frame. Then flush out the crud. A rust treatment will get nowhere if it's full of dirt. Let dry thoroughly (several hot and dry days) then spray in very thin Tectyl. There is one with consistency like CRC with excellent creep abilities. Let dry for a couple of days and follow up with a rust treatment that flows easily. That support inside there will prevent a wax like treatment to get past it.
I'll take some pictures after opening the frame so you can see how it looks inside. Hopefully that will help you improve your rustproofing. You can make holes in the frame if you plug them with plastic plugs when done.
