It's been a whle since i've updated this but some progress has been made, i've fitted the sierra vented brake setup now along with a mocal oil cooler and a few other bits and pieces,
i've had the repair panels welded in to the rear arches and painted them up. Few pictures:

I ended up having the braided hoses made up to connect the calipers to the hoses on the car as recommened by someone on here.
The standard exhaust is still on there at the moment, i've given up on the tubular manifold idea for now. Got a load of 2" stainless pipe and fittings from jetex to make an exhaust to connect to the original manifold. Waiting til after the mot to fit it tho as theres only going to be 1 silencer.
I'll let you know how the mot goes.