Got the oil tank repair done with mods. It turned out, bottom mount plate had to be fully welded to tank skin. Leak was somewhere under the plate probably at a spot weld. Suspiciously it looked like the spot adjacent lower front mount. Custom bracing underneath and battery box upper mount fabricated by hand. Spent quite a bit of time ensuring stress at mounts was minimized, shims, alignment etc.
Tank skin is very thin. Welding by TIG. Braces/brackets 2mm & 3mm.
Oil tank and battery tray were not perfectly square to each other but anyway I made the mount to suit and shimmed it for fine adjustment.
Bike came to me with a missing battery box mount, the one under. Therefore the oil tank would have been taking quite a hiding with the weight of the (existing) big, heavy battery.
Early setting up for upper battery box mount bracket..
How I did the filler bung. It needed to be in the front corner to clear seat. The tip is to bore the hole then make the insert exact size. This makes for easier TIG because there's no gap to bridge.
Welded and ready to install
Underneath, note hole for oil hose to pass through.
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