All Seariders are hypalon - so follow instructions on Polymarine's site for gluing. Ambient air termperature, a clean working environment and ventilation are absolute key to a successful fit.
Regards gluing 'D' rings, then you will need to remove the painted area completely by sanding and degrease with solvent or the attachment will fail.
There's a mixed response to painting RIBS, with the preferred approach to avoid like the plague, but take your point if the whole boat is already painted, then not sure you have much choice.
Is that with or without VAT?