A mason heater friend turned me on to https://www.firespeaking.com/, as a source for stove doors suitable for a batch box RMH at a very reasonable price. The owner, Max Edelson, builds masonry stoves and rocket mass heaters, so he gets it and can give some basic advice. I was stoked to find this! Photos fo some doors below, you can download a catalog and price list at the website.
I downloaded his catalogue a while back and agree that he has some beautiful doors indeed!
There are a few things I would double check though.
1) That you can modify your batch opening to accommodate the size of the doors available
2) That the air inlet is large enough to meet the batch box air requirements