With no answers yet on this question, in a genuine attempt to assist I respond in good faith as below. I see you posted on SA also and it is a Dix PH 38 and you got some answers. I won't ask what you want to do with the yacht as assume you have decided this.
forums.sailinganarchy.com/threads/deck-house-cruising-yachts.244218/I have not owned or sailed on any of these, but am aware of the first two and their designers.
Dudley Dix is an excellent and prolific designer. But if the DPH38 has rust issues it is suggested that you be extremely cautious. Is it this one? maybe not as rust is not mentioned albeit adverts accentuate the +ves not the -ves.
www.boatsonline.com.au/boats-for-sale/used/sailing-boats/dudley-dix-38-pilot-house/296977 "Rust issues" can mean a lot of things obviously - where, what is the area extent over the hull, what is the loss of parent material thickness over these areas, etc etc. This site includes prior discussion of extremely experienced owners having to walk away from 34ft yachts as it rusted away under them - of course obviously individual circumstances have an impact. Many steel yachts are still going strong decades after build. Many have needed extensive repairs. There are many good articles on line eg
www.safe-skipper.com/steel-hull-maintenance/ and
c-tow.ca/read-this-before-buying-a-steel-boat/#:~:text=Steel%20boats%20will%20often%20rot,end%20up%20sinking%20your%20boat.Huon 36 is it this one?
www.adelaideboatsales.com.au/boat/291404/huon-36-motorsailer/ HankK was a very good designer and
Rod Goode a similar capability builder and did some designs
www.seabreeze.com.au/forums/Sailing/General/Boats-of-Port-Huon?page=1See page 10 he co-built Intrigue which I wasn't aware of but should have been - Intrigue the beyond legendary Tas yacht
ryct.org.au/wp-content/uploads/2021/10/TAS-YACHTSMAN-issue-10-2020-WEB.pdfThis H36 would be my pick of the 3 by a fair way but if the above is the one the advert text is in parts woeful - hull and deck timber and epoxy grp exact configurations and scantlings need to be sorted. Don't believe ply/ply should be in hull material. Maybe they mean 2 layers of diagonal cold moulded ply with celery top pine strip planked outer layer then epoxy glass sheathed. Assume deck is ply epoxy sheathed. Best to find out. Does it have any more fore sails than the furler?
Sailfar 40 - this one?
mansfieldmarine.com.au/mansfieldmarine/yachts-for-sale/used/sail-monohulls/sailfar-yachts-deck-saloon-40/290468/ Never heard of them sorry but my bad. Just found a good summary of the boat here which you have probably seen;
abba.org.au/pdf/nov_dec_2009.pdf Appears "composite" hull and deck means ply glass sheathed. Experienced designer and builder obviously. What has been its history since launching 2010? Nice looking boat but a tad angular at pilot hoise fwd end and stern. Tiny wheel. Seems like a one-off? Re-sale issues?
All the best with your search, let us know the result is you want to.