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Most of the games are on our [itch.io page](318arcade.itch.io), but they're not as up to date as the arcade versions. You can find 15 Coins (the orange one) on Google Play. The developer should be putting it back on the iOS App Store soon. You can find When It Hits the Fan is on Heartfelt Games itch.io page. It's also coming to Steam on the 19th.
I don't have CAD files or blueprints or anything highly detailed like that. I keep a template around that's got all of the holes in the right place. When I update the design, I update the template and fill in the old holes with dowel rods.