I like it, but I would prefer it not have the cutout for the top systainer handle. Seems like a big area is taken out of the worktop, exactly where I would no doubt be wanting to work on it.
Can't really see much advantage of having it cut out just so one can open the systainer. Be easy enough to lift the top off if required anyway?
Other than that, I have the standard systainer with the mft type holes in it and find it very useful, but lacking in area, this solves that problem.
Cool idea.
Think I would like to make on myself at some stage. Curious to see how it's clamped on securely?