I'm assuming that this is the correct place to post this. It is really just me pointing out that these items are available, I haven't done any advertising so perhaps some people don't know that my 3D Print of the Britannic Gantry Davits even exists.
I have personally had some printed. Some other people appear to have bought them. I'm yet to see a model complete with them, but my 1:350 Britannic is shelved at the moment, so someone else will beat me to it.
I hope that some of you might find this interesting, given the regularity with which newcomers ask about conversion sets.