Got my Hartley Tasman out of the water on 5th July at Montys Marina in Caboolture. The damage noted by Maritime Safety Queensland - the cause of the order to haul out - is, as I suspected, totally superficial and well above the waterline. My only surprise was an unknown log sensor that had been smashed, which might have let in a small amount of water. In any case the hole for the wiring was tiny and the bilge pump wasn't constantly working so I regard this as trivial.
I'll be at the yard for the next six months doing a comprehensive scrape, repaint and replacement of some broken pushpit railing and fitment of davits. I plan to make all this out of galvanised plumbing pipe because stainless steel would be ridiculously expensive. Fortunately my nephew has access to a powder coating line at work and will be coating it all before it's installed.
If time and finances permit I'll also tidy up the inside by stripping all timber and recoating with varnish, and also reinforce the galley shelving. I'm also on the lookout for a 10hp diesel to install, replacing the 6hp outboard which is usable but not really optimum for the vessel. The mast will be coming down so I can wire it properly, replace running and standing rigging and add a wind sensor.
This is a lot of time and effort to spend on a yacht that, to all in tents and porpoises, has zero market value. OTOH I intend to circumnavigate Australia in her as my first proper trip and anything I do now will pay dividends in peace-of-mind and comfort for the next two years, so I consider it worthwhile.