Here are some details of a big job on Currawong. This will be of interest to other owners of Baker built Magpies and Brolgas and anyone considering sub $20K boats with integral steel work.
When I bought the boat, I was always worried about the steel ring frame unit that the mast sits on. It was corroded, but based on an opinion from a surveyor, rigger, support from this forum and generous tapping of a hammer I got some comfort that it was ok. You can see the original in the video that Ramona found in another post on this forum. Looks pretty good doesn't it ?
The boat creaked and moaned inside when driven hard. A while later, on closer inspection with a big hit from a hammer I was able to get a screw driver easily right through the frame. It looks like a previous owner sanded down the rusty flakes and painted over the metal to make it look sound. Most of the corrosion was inaccessible where the frame sat in bilge water. The entire thing was on the verge of collapse. I looked at lots of options, but ended up replacing the original steel unit with an identical stainless steel replica. The cost was not as much as you might think and is keeping with the original style of the boat. Fleming Marine did most of the excellent work. All the creaks and moans are gone and the boat feels much stiffer.
Quite amazing how strongly built the Currawongs are. The ring frame floats above the keel, but is solidly bolted onto two longitudinally bulkheads that run behind the benches. Despite this there must be big forces involved with the chain plates so far inboard and the frame in tension keeps the two longitudinal bulkheads tied together. I guess this also helps generate space for the generous head room the boat provides.
Here it is just after removal.


Locating the new unit in place. On the floor behind the frame you can see two 10kg lead weights that were glassed in a void. I removed these and are replaced with emergency anchor chain.


Old and new side by side, both weigh the same. The original was used as a jig as it was slightly asymmetrical and probably cut to fit in the Baker ship yard.

It is much worse in the flesh than these two shots suggests.

Here it is today. You wouldn't know it was replaced.