Answer

Can I buy it in Singapore?

Not yet, we’re focusing on North America now, (where we are based). However, we tried a few shipments to Europe as an experiment.  It worked but we still have some learning to do.  Both tariffs and shipping were quite high. I’ll blog more on this later.   -Chris

Compatibility with 21UX cintiq

I would not recommend adapting the Cintiq 21UX to the MT11 Kit.  The cables for the Cintiq 21UX would need to be routed through the XOOT_Pro arm, that not an easy job.  Then there would only be a short cable length outside of the arm. Thus, adapting to a Cintiq 21UX may be possible but…