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Could you video the experiments, then use that as a source of evidence for your research? Because it sounds as if your demonstrations are a visual version of what you would explain verbally, so the two methods fit together well and enhance your overall discussion/argument in a way that wouldn't be as powerful separately. You could refer to the content of the video in your writing, maybe also use some stills as illustrations in your text and include it at the end of the written thesis on DVD as an appendix.
I'm not an artist, but have documented a lot of my subject matter as photographs as it's evidence, original data that supports my discussion and is integral to my research. A video/DVD sounds a great idea for you though!