Seaweed page 4; Tango p. 9; PenGwyn p. 15; Wide body p. 19; Blue water ship p. 19; Box boat p.20; Whitehead p. 25; Finisterra p.30
Also at Tanton yachts: Aventure p.3; 895 p. 4; 962 p. 7.
consider twin- or bilge-keels an option... RM-yachts produce very light boats in plywood hard chin... they have a lot of sail for their light weight, twin-keels and are beachable...
The Bruce Kirby 43 might have been designed with your brief in mind. One has been built by Sea Island Boatworks in Charleston, SC. I've seen this boat and it is impressive. Sits level when beached and is a ketch rig with B&R mast rig. http://www.nisboats.com/mainpages/nis43.html
if "tincans" are an option as well - there are quite some boats out there fulfilling most of your criterias... some of them might not be considered an ULDB though...
atlantic 43 hk
aaliage 47 (not exactly 12 m... )
all of the above mentuined boats feature lifting keel, double rudder, are not what you could call heavy and could be laid on the beach... but are made from aluminum...
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