Thanks guys.
At this stage the mounting brackets are 1/8? strip steel tacked on with 1/4? rivnuts using stainless countersunk head machine screws.
I haven?t countersunk the panels yet.
I have spaced these 1/8? so there is room to reinforce the area and / or the screw to pass through a panel lip so the screw will be holding two panels together.
I am thinking of these all round but may revert to dzeus for the engine area. The body side panels with only three points of attachment so far are quite rigid; the fibreglass was laid up at a little under an 1/8? thick so that, hopefully, they don't need dozens of attachment points to hold their shape.
Did I mention I am winging it wrt the body?