Please pull my idea apart, or suggest whether this will work.

All the designes seem to rely on a canterlevered crane arrangement. In fact you have a huge lifting capability in the mast via a topping lift. This could very nicely aleviate much of the lifting stress on the end of the crane. So just using the crane structyure to steer the o/b or MOB from outboard to over the rail or inboard. Just a thought good luck olewill
 
All the designes seem to rely on a canterlevered crane arrangement. In fact you have a huge lifting capability in the mast via a topping lift. This could very nicely aleviate much of the lifting stress on the end of the crane. So just using the crane structyure to steer the o/b or MOB from outboard to over the rail or inboard. Just a thought good luck olewill

Agreed, I used the boom as a crane to lift my generator from the dock and lower it into the aft locker but as a outboard crane its too short, it would deliver the outboard to the cockpit but not the bracket on the pushpit.
 
The old Plastimo system is still available>

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I lifted mine with an extension from the end of my boom supported by the main halyard with plenty of side support to the boom and the pole. The main problem is that as soon as you have the weight of the engine supported it swings round to a strange angle. It doesn't want to hang in the right orientation for lowering nicely onto the bracket. It is a real effort getting it to line up. There isn't anything really useful on my engine to attach the line to which doesn't help.

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You propose "25mm 316", but that only describes bar, when you're clearly planning on using tube. 25mm tube comes in varying wall thicknesses, and believe me, the regular 1.2mm bimini stuff will bend. I'd suggest thicker wall tube for the higher-stressed elements.
I believe we may have supplied the Bimini and if so, the tube will be 316 25 x 1.5, and not the thiner 1.2 used by some other companies.

John
www.tecsew.com manufacturers of biminis and boat covers
 
Myself I would hoike it up along with the dinghy on the foredeck by winch or windlass and take it from there.
+1
4 way bridle on the dinghy, Then a line through a small block at the end of the pole terminating in another small block. Halyard through that, a few seconds on a winch the dinghy is up, release the line terminated in a block and the dinghy swings onto the foredeck. Easier to do than to describe :)
 
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