I also vote for building your own. Not because there is anything wrong with any of the prexisting products, but because of the fact that they all look like fried booty* when attached to a prexisting cabinet (because they don't fit correctly).
Without exception every single cabinet I have ever seen that had a hotrod or Xarcade on it looked bad**. They don't match the cabinets. It is like taking a nice red Ford Mustang and putting a blue hood from a Camaro on it.
* With the exception of the slikstick, which you can design a cabinet around or often nicely fit to a prexisting 4-player cabinet. But if you can build a cabinet, then you can make a control panel yourself.
** If you are reading this and you are one of the people that has a cabinet with an Xarcade or Hotrod on it, yes I have seen your website, and yes your cabinet looked bad. Sorry, but it is the truth.