I ordered the MK3 kit first, later I ordered the MK3 to MK3S upgrade kit. But it all started out as an MK3. MK3 kit assembly. The MK3 kit is much better then the MK2S kit I assembled in June 2017. I own a BQ Hephestos 2 as well, I disassembled it for pieces. But it has a similar more sturdy frame, the XY plane is screwed onto the XZ vertical plane. Both side...