It would be great that your boxes allows to install flange and dome. I am able to fit a whole BR2 electronic + batteries in the 5L. Just missing domes. Maybe to consider in futur iteration of this product?
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Hi @Charles, thanks for the suggestion - I’ve raised it internally for our product request tracking 
I expect the manufacturing requirements would make it impractical to add flange support, but there could maybe be some kind of clip attachment system that could make it feasible to attach end caps (including domes), albeit likely with a reduced depth rating.
That said, depending on your performance, cost, and timeline hopes it may be more straightforward to modify an existing box to support a face-seal end-cap connection in the size you want.