I was wondering when the building feature will come out for android
It is actually already there. :) But there is no keyboard support in the Android app at the moment so you can't access the menus.
Not sure how I should do it... The simplest way is to popup a virtual keyboard. But I'm not sure that would be good enough. The Android version was just a proof-of-concept so I never intended it to be used for anything else then observing others play.
Do you use a phone or a tablet for playing?