I'd say the skills needed to make the wishbones are comparable with those needed for the chassis itself. I used the box jig a-la-Talon, ground the mitres with an angry grinder using templates from tubemiter.exe. I had the threaded tubes made, bush tubes trued up on a lathe, other than that it was a pleasant job, totally within a reach of a hobby DIY'er. If you mess up it's not hard to remake one, or get them made if all else fails.
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