The problem as I see it is that with a large amount of stainless below the waterline there's going to be a big difference between the anodes and the hull on the galvanic scale. The anodes may vanish quick smart, followed by the rest of the underwater parts
in ascending galvanic order.
It's not a problem on a regular steel boat as there is only a small amount of stainless used and the anodes protect the rest of the steel from it.
But why not use regular mild steel for the hull, and stainless everywhere else.
It would be great for the deck
as no worries re corrosion.
protector, rub rail, all those corners that chip on the stern - they would all benefit from having stainless covers welded on top. Toe rail inward could all be stainless.
The cost would not be huge, and since working with thin stainless sheet and tube would become second nature it may end up a quicker way to build a steel cruising yacht.
Only problem that I can see would be the "bling" factor. Would need sunglasses or some serious abrasive blasting to take the shine off, and some would need to be painted.