It looks pretty small, but I know its only temporary (and they get play time each day). At an absolute minimum, the bun should be able to lay down fully stretched out without hitting the sides, is that the case here (it’s hard to tell from the pictures)?
You might think about making the divider out of small wire mesh (you can get 1/4″ hardware cloth from hardware stores that works great), so they can’t nip each other but can also still see each other. They will probably be happier that way and it will help with pre-bonding.
Ideally you could get a second dog crate and just have them side by side. Would that be an option for you? You can often find them used online for pretty cheap. Sometimes animal shelters also sell ones that have been donated for low prices.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.