I'm interested in hearing about a 6040 as to be honest even though I'm perfectly capable of building one I just don't have the time.
I have 3 personal mill conversions on the go at the moment.
One from 3 years ago ?

The short comings of the 3040's are obvious from looking at the machines, unsupported rails, so so electronics and now we have hands on reports the spindles are next to useless but the 6040's in high spec mode from various sellers have the water cooled spindles.
Jazz did a costing exercise and he reckons that it's possible to build a 6040 size machine but better for the same money ? however he didn't make it clear if that was working for ones self, count labour and it's probably not and the way work is at the moment I just don't have the time.