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I like this! I’ve had a play to encase the concrete base with a black I beam, run it to the garage door and over the top. Plant the trough with sedums to replicate the porch? Have you thought about side opening garage doors, but with a 1/3-2/3 split to copy the windows? You could also inset the opening by 300mm or so to loose the flatness of the front and again replicate the porch, but in relief.
I like playing with your design, because I can’t come up with anything for a storm porch for our place.
Porch idea
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