That'd work I'm sure Hugh. Nice hackle. Looks like it's tied on a grub hook, a straight shanked hook is traditional and straight-eyed too. I saw Paul Procter give a tying demonstration on Monday and he applied a lighter briefly to a hook eye and straightened it with de-barbing pliers for the CDC hackled Bloa spider he was showing.
If you can get your hands on some Pearsall's silk it will bring a glossiness you don't get with Uni thread and it lays down in nice even wraps without a hint of flattening. A yellow thread (Pearsall's no.4) darkened with dark wax to olive, if you wax one side of the thread it helps give a segmented appearance, and dubbed with the smallest amount of mole fur is the recipe for the body of a Waterhen Bloa. The best spider BWO imitator and a third of the holy trinity cast alongside the P&O and S&P.
Good video SBS here.
I like a spider with a dubbed thorax. It helps kick the hackle out when wet. I'm sure synthetic is fine but the body hairs of a small rodent will win you extra points. Mole, mouse, 'water-rat' or some obscure Californian equivalent has got to be better than plastic. On other patterns a wrap or two of peacock herl serves the purpose.
Keep them coming Hugh!
SharkeyP