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One place to start looking is in the source code of the QMK firmware. They have subfolders for many keybaords, and most of them have a picture. https://github.com/qmk/qmk_firmware/tree/master/keyboards Most of them are hobby projects though, so soldering will be required.
Just an idea: you could attach the two halves of a split keyboard to a wooden board. The piantor is a corne-like split with hot-swap choc v1 sockets that has been designed to keep soldering to a minimum. Some soldering still required though.
I bought them from bol.com in EU, but they are also available from Amazon.