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I think that the suspension on the Aussie lakester is a great way to go. It keeps the suspension parts mostly out of the wind and also it would be fairly easy to add wing shaped fairing around the axle, steering and suspension, which if you are planning to go 290 will be important. I have attached a pic of the front suspension on my son and myself's small lakester. Our challenge was to get every thing inside the body, not completely successful, had to make a couple of blisters to cover one of the links, but Duke has a plan to fix that for this year. Our body dia is 25 inches but where the suspension is it is only 13 inch dia. at the front and 18 inch dia. where the shocks mount. We ended up with a lot of parts but it works pretty well. You do need a strong front axle, ours is a 1.50 x .125 wall 4130 inter tube and a 1.75 x .125 wall outer tube, 4130 material. Our front wheel loads are pretty light at 200 lbs/wheel.
Looking forward to watching your lakester build, I know it will be interesting and inovative. You planning to run your roadster engine?
Rex