well Vic,
Its funny you should mention that because, having banged my head against the wall for e reasonable time, I need to ask another question.
with regards to the galleries the instructions say
View attachment 376997 keep the upper edge of 43 and 43 the same as 44 and 45 but have lower edge of 42 and 43 a little lower.
personally i have never found " a little" to be a reliably accurate measurement and was looking for some guidance perhaps in mm or even inches, anything other than "a little"!!!
Hope you can help
Neil