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A terrific looking model engine. Like several modellers on this forum, you are a craftsman and it's a pleasure to view your posts and see the work being done.
I particularly like the belpaire firebox on that model ... it "makes" it for me.
I can't really help you with your construction dilemmas although i have full sympathy with you. It can be agonising to decide the best method to accomplish a task, especially when you are also thinking about the next ten steps in the construction that need to be taken into consideration. As for the glass in the windows i think i'd be trying to build a slot into the side walls of the cab to enable a glass piece to be slid into place after the painting is finished.
Best regards,