Thank you. The BoundingRect() idea did work for my purposes!
To future reviews of this thread, the below snippet shows setting of my primary label and I get BoundingRect so I can get the height to place an element just beneath it - this worked for me:
sub init()
InitWidget()
end sub
sub InitWidget()
townLabel = m.top.findNode("TownName")
townLabel.font.size = 80
townLabelRect = townLabel.BoundingRect()
stateLabel = m.top.findNode("StateName")
stateLabel.font.size = 40
stateLabel.translation = [0, townLabelRect.height+5]
end sub