Little feedback from someone who bought this a little while ago to use it as a numpad:
It's a really cool little numpad, I certainly don't regret buying it, I think it looks awesome (see picture), and I had a lot of fun building it. However,
-The first row ("fn", "tab", "=", "backspace") is so far up it's impossible to reach without looking (which defeats the purpose of a numpad imo). No set of keycaps has dedicated keys for those (especially "="), and it's not aesthetically pleasing either. I don't think anyone needs 6 rows on a numpad and I would have much preferred a 5 rows version.
-That "00" key is an abomination. Can you imagine how many typos have been made because of it? And not just typos, but numbers multiplied by a factor of 10, no less! Perhaps the single most dangerous typo anyone could ever make, just so we don't have to double-press a "0" key. This is a ridiculous idea and I wish it would be removed from the next model.