A little adjustment on the bottom of the overflow tank allows it to sit on the engine mounting plate & 3x rivnuts+thread lock to hold it in place:
Completing the cooling overflow plumbing.
I routed the main overflow pipe as far away from the exhaust manifold as possible.
I think the final loop may be a little short - ideally it should be dumping any overflow water direct to the road whereas its current location will just fill the side panel floor (when its installed) - on the other hand, nothing should be coming out of it.
Update - I re routed the true overflow later in the build, back past the gearbox and down onto the road so any overflow doesn't merely fill the engine space floor with coolant.
