I started lining up anhedral stabs in 1977- using the ol stand back a center and squint method.
I added a sekrut tekneke- setup the lighting to cast an even- low angle shadow -front to rear .
Using this method -I can get it spot on.
after all is said n done -the worst errors are usually found to be hinging errors so all the alignment setups , which all the special fixtures in th world will not correct

anymore -I fly the plane and then tweak trims as needed
The methods used by carpenters and builders -over the centuries - work fine on these models
I gave away all the do dads my son purchased to do alignments -they were nicely made and gave the numbers but I never saw any improvement in accuracy