Looks good. The 4.3 is good because you have mounting points but for the 7" you are going to need something to clamp the LCD into place.
Impressed by the price. I did a small run of 15 units on my 7" panel and the cost per board alone was $75
I was going to offer the extra units for sale but might just hang on to them as I doubt I will be able to sell them
If anyone if interested in a Front Panel Express design for the 7" which has the cutouts to suit and gives a nice alignment for the display, let me know and I can send you the file. You can modify this to your own size but the cavity on the rear fits the LCD snugly.
Why is there no 5" option?