There is one in my mooring field with an outboard on the stern. It's been here nearly 2 years and I have not seen it leave the mooring yet! I've had a close look at it while I was talking to the owner. Topsides are much higher than a Tophat and it seemed lively on the mooring so I suspect a lighter displacement than a Tophat. I reckon with an inboard diesel they would be a better boat than the outboard adding weight in the wrong place.

Hi r13. I didn't buy it, but I came very close to to it a fair while ago around 1991.
The following is from memory, so dont quote me - the brainbox is a bit faulty, but:
Was designed not to a rule, but for racing and comfortable cruising on the Parramatta River (hence the PR) and Syd Harbour. Can't remember the (local) designer sorry.
Some sold as bonded hull and deck only for home fitout, but there was an internal moulding available as well which only needed timber trim to be added before installing extras etc. Some had factory fitted timber. Was also offered as complete fitted hull ready to rig.
Pretty sure it wasn't a full moulded long keel, but a cutaway molded keel, with a skeg(I think) or keel hung(maybe?) rudder.
Surprisingly roomy inside with great, if not full, headroom in main cabin (i'm 6'2"). This one had the moulded interior.
Designed to use a (usually 2nd hand) rig from the 5.5m class. Deck stepped I think. Like the gear from Etchells of today, there were lots of sails and rigs available from 5.5 owners who were updating.
Only got to sail it twice, both midweek, so no real comparison to others, but I recall it handled comfortably and pointed well too. It felt like it was quicker than my mates Dads TH, but like I said - hard to tell.
I think the inboard was about 12hp.
Built solidly, the only structural problems I'd heard of were hull/deck joins, and bulkhead under the mast step. The bulkhead had already been addressed in this one. Some of the amateur fit-outs were rubbish apparently.
FWIW, I hope this helps.
(read paragraph 2 again)