How accurate are the ideal weight calculations made by measurements of body parts such at bone diameter and stuff?

Long ago, before I got more obese, I had such a measurement done at a gym by one of their people. They came out with 225lb. The vague BMI calc says 189 before stepping into obese category. That is a 19% difference. I do have slightly larger leg and thing bones I believe from profilic bike riding as an adolescent.

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Maybe get a Dexa scan at local hospital?

It sounds expensive, and I doubt my insurance would cover it.

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Google says $125 -- not cheap, but I know I'll do it when I get another 40# off.

The BMI recommendation is probably pretty close to the ideal. BMI is only inaccurate if your lean body mass is either unusually high (or even more rarely low) -- most people have quite normal lean body mass.