the TOP slowly starts to sink after adjusting/cutting/sanding/test-fitting the TOP over and over again...
you cannot really rely on measuring one side to copy it over to the other side due to the tolerances of the TOP/Car...
Prepare to have a helper handy...lifting the TOP a couple of times
Oh...and I forgot to mention that all the holes for the screws need to be drilled through for the screws to fit all the way
slowly getting there.