Alright, let me try to answer a few questions.
I am still emailing back and forth with SP (manufacturer) to settle some inconsistencies with the kits shown on the website. That's why I haven't posted before.
0) This set is only available on the PMK (SP) website, so no EU distributor atm. Unless someone is willing to become one and place a bulk order at PMK (like 7bit did with his set)?
1) The 6.25 spacebar will be part of the alphas kit, so no need to have it in the other kits or buy it separetely (Originally I wanted to have a separate spacebar kit, so ortho/ 40% people wouldn't have to pay for a key they'd not use), I do recommend the red spacebar though!
2) The 6.25 spacebar kit contains the red and the green one (and the white will be moved to alpha's)
3) See Q nr 1, spacebar adds about 1 or 2 $ to the price of alpha kit I believe.
4) I am thinking of running this set in a different profile in the future, PBT has my preference so KAT sounds promising. EU and Asian proxies will definitely be part of that (I'm EU based myself, and will have to pay custom duties too). Will have to rework the kits to include the different rows of course.
Colored mods/alphas: as the set is already quite large, PMK didn't want to run alternative colors yet, if it will be popular, it's definitely possible, so let's hope
Also - the 2d images are a bit misleading, please check the renders in this thread - the white is much more white that creamy yellow, the pantone is called "Winter White" btw. Combining them with other mods would clash more because of the font, which is unique to this set.
EDIT: here's an example of the colors: