buying pre cut is a great option
problem with square is how it deals with loads, because it has corners these can become stress points and may lead to failure. yes you can just make it out of bigger stock but why make it big and heavy when you dont need to.
i think andy at saturn may be able to do you a set of pre cut wishbones.
there are others aswell but andy was the first that came to mind, also worth checking ebay.
tilly
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