This is not a custom stand, but one of the best solutions I’ve seen and the one I’m using for all my second level/tier equipment on my desk now:
It’s an Amazon laptop stand, super nice build quality, very sturdy, and it has the advantage that tilt and height of the stand can be freely adjusted, which is very nice and was a major bother with other stands (even custom made ones) that I had. I have four of these (paid 22€ each 
), with an A4 mk1, an OT mk2, a Dreadbox Erebus, and a Dreadbox Nyx on them.
I’m so happy and excited about how well these work that I thought I’d share it here.
Here a few pictures to give you an idea of how they fit:
