Not sure how much you want to get into this as far as designing you own. Nor if your looking for brick or wood. If you want to create your own unique buildings. You could check out Tichy Train Group. They sell an assortment pack of their doors and windows. A lot of laser cut kits will use their windows and doors. The assortment could be used to measure the openings you need to cut for them. Then just purchase what you need to complete it.
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