I only bought mine the other week and it includes the updated kit contents. It now includes some rubber feet and silicone dampening for the inside. The feet offset the curve enough that I do not notice it.

I imagine the two pieces that many to the base contribute to bend. If it were a single piece that was thicker I do not think it would be an issue.

I recently purchased one as my first proper mechanical keyboard. I am pretty happy with it apart from the case bending when built. I have not been able to fix that, I assume it is because of the knock-off Lego pieces it uses. If anyone has any solutions to this, I would appreciate if they could share them.

I also bought the upgraded stabalisers from the site with the kit (they sent two lots of them rather then the stock ones included in the kit). I would say they are not worth it, they are supposed to be pre-lubed but mine were almost dry. I have relube them to get rid of the rattles.