OK the first 20g is gone, but I have one more. It's a standard 20g with a light fixture. Here is a picture kind of ugly but you get the picture. $150.00 and I can drill if needed. The front is seemless.
I have not yet, but i am going to for mt 29g. Keep in eye out in the DIY section. If it goes well I might offer a few for sale. Also if you want a 20g in those dementions I mentioned let me know.