Stephen
In my opinion I can see little to be gained by lifting your rudder if your keel is down except to keep it clean.
If you intend to keep your keel down there is the issue of maintenance to consider.
I have had a 21, 275 and 325 and except for the 21, which was dry sailed, the keel has always been an issue.
With the 275 I had trestles made that held the boat at such a height that I could drop the keel for antifouling see
With the 325; not wanting to work at such a height on deck, I had the trestles made just high enough to enable me to get under the boat for antifouling.
I can only antifoul the keel when the boat is lifted by the crane
(Bruce Parker under the boat in this instance)
I think you said there was no possibility of cranage on Mull, so I guess the question I have is; do you need to moor the boat during the season, or can you dry-sail it?
If so, you can then forget about all these issues of swinging around a mooring, and your keel will stay relatively clean for the periods the boat is in the water (or so I found with my 21).
Of course - what I don't know about the 235, is the possibility of drawing the keel up through the deck (as one could with the 275 - though I never did it), in which case this could be a solution.
(Perhaps I should start a new topic on Boat Maintenance as I have drifted away from swinging moorings)
Regards
Don Harvey
Web Master
Parker 325 'Calypso'