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Do you have a test CRT to fit into it to check your work?...If not I wouldn't touch that project unless they live close enough that you can readily drive there and back.
Generally the B+ is more dangerous than the HV lead for the side of the CRT. It takes 30Ma to kill a CRT only draws 1/100 of that max without sagging the supply...I've been bit by it several times and am alive to talk about it.(If the tube isn't installed stick it in a glass jar or cup so it doesn't short to ground or nuisance shock you). Safety concerns are comparable to a standard tube device, B+ is typically over 300V and can supply 10x the leathal current all day long (so don't touch it). The voltages on the yoke and plate leads are comparably dangerous.
You're probably never going to get it right without a test CRT, the customer unless (a fairly technical person who owns a test pattern generator or DVD) is never going to get the sweep adjustments right and if you live too far apart you're going to play UPS/FedEx tag till they destroy the chassis or the customer runs out of money/patience.
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