I was looking for a smallrig cage for my small Sony A5000, unfortunately smallrig company has discontinued the cage for A5000...
By chance, I've found a cheap smallrig for the Sony ZV-E10, which fits almost perfectly to the Sony A5000. I see that it needs a little DIY to be able to open the battery lid cover after that, my Sony A6400 and A5000 will be in the same size and similar in weight.