A productive day!
The brackets are mounted on the uprights and fully torqued up. All exposed threads have been brushed with the water resistant grease.
The mating surfaces were covered in a copious layer of Tiger seal before the bolts were tightened up to compress the joint. The bolts are fitted upside down at the moment as it was far easier to temporarily fit them like this whilst there was wet Tiger seal around. I intend to replace them with black bolts (maybe nylon?) once the adhesive has fully cured.