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I don't like polybushes and I don't like rose joints, at least in a road car and we need to consider that point carefully. Is the end result meant as a road car with the ability to go that much further along that track or do you want something that will climb Ben Nevis with ease. I was the GLASS rep. for Warwickshire and I organised green lane runs all over and one day this guy turned up with a tray backed Hi-lux on big fat tyres. It was hopeless. The back end was so light it skipped about and on wet grass it was lethal. Think carefully about your ultimate aims and remember that you should not attempt to emulate the abilities of a guy who has spent a fortune to get the very best and is determined to show everyone how to do it.
Going back to rose joints and my apparent dislike of them is based on the fact that they are for competition use. Yes they are wonderful at controlling movement and giving you flex aplenty but on muddy or sandy tracks wear will be prodigious and vibration will be unpleasant. Noise vibration and harshness (NVH) is a major concern to a car maker and chunks of metal bolted underneath a motor is proof that to combat NVH needs must.
We all start out with a motor that is better than us and hopefully we progress to being better than the motor. At that point we should have accrued enough knowledge to know what to do next.
Roger
ps I agree with zukebob, the slot won't work, it would tear itself to pieces.
The best analogy for understanding how the suspension moves is this: Hold a stick horizontally in front of you in both hands. The stick is the axle. Your arms are the radius arms. Grip tightly and move one arm up and the other down, as if the axle was articulating. You should feel resistance as the broomstick tries to twist in an opposite direction in each hand. It is this twisting movement that causes the radius arms to bind up.
Years ago Rhino Ray produced radius arms with a pivot at the chassis end to supposedly allow more flex but it never really caught on. I don't believe this is the plane of movement that is causing a restriction.
Here's one example of modified radius arms that aim to allow more twist at the axle end of the arm:
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