The only other consideration would be that cut up tomatoes are very WET. So, a good seal on all the components is a must. The primary problem with the setup and no larger feed tray is that some of the chunks can fall out of the smaller tray and land in the squeezin's which are directly below. The larger tray that is for sale sits on top of the smaller one at a 90 degree angle and basically prevents this contamination of the squeezin's with unwanted seeds or pieces of skins.
Now, if you mean to make something that will allow a LARGE bowl of chunks to be mounted and then fed into the hopper, then I will offer my vast years of analytical testing and quality monitoring to help you evaluate your new invention that could be patented.
Take care, my friend