The following pictures show what's floating about in the back of me 'ed
I've outlined the position of where (approximately) the custom inner wheel arch will go.
The plan is to use a similar solution to the solution available via the vkv club (Dutch Volvo club I'm a member of - see previous posts at the start of this thread)
https://www.volvokv.nl/onderdelensho...athway-2422654
Thing is I don't fancy paying 140 euros for their solution when I can add in a bit of extra robustness. I'll be fixing my custom inner arch to the outer wing with M6 bolts.