Ok. I pulled the code and took a look. I'm pretty sure where your difficulties are coming from, but need answers to a few questions in order to give good answers.
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what does ultrasonic.timing() return?
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What does ultrasonic.convert(x,Ultrasonic::CM) do/return?
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Please explain (brief please) what myservo1.writeMicroseconds(n) does.
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What is the range of the ultrasonic device?
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I'm not sure what the proper vocabulary is, but what is the aperture angle of the ultrasonic device?
This looks as if it could be a really fun project! 