I like how all of your graphs are easy to read, and that they are all positioned together so it is easy to compare the results of the different products. A small detail I also appreciated was having a different color for each graph. I wish I had the option to create that in the survey program I used.
I wish you would have included the sketches of the 5 ideas as a refresher. Seeing the original sketches would offer the reader the idea that you had and how it compares to the products on the market.
What if your heated cutting board was a “slide out” contraption instead of a “pull out” contraption? It would save more space within the counter and it would be stationary so people can’t touch the heated inside.