I have seen Ian`s style of cradle and think that this is the way to go. Plastic pipework as very flexible and wobbly, and likely more expensive to make than the wooden variety, Personal opinion.
I am young and muscular and hitherto have not needed any lifting things. Colin has shown the way of course when he visited our pond , but not everyone can afford young nubile boat launchers.
Ian, do you have a handwarmer in the carrying handle for cold days?? 
Ashley