Hello, I'm new here so please excuse my virgin post count, I used to be pretty active over on the
40k forums. Its been a while since I posted on forums.
I made and designed the 5 gallon bucket kits you mentioned seeing in adepticon photos. I also created all the buildings from the titan battle. They were shipped out to the organizers of the event and they did a hell of a job with the painting and assembly.
They are all
MDF kits that I laser cut. They are all designed to be hollow inside and separate from the base so you can put a pile of rubble inside and remove the building from play when it is destroyed by one of the god machines

My company worked with the event organizers so they could have exactly what they wanted for the event.
All the buildings seen will be going up on our website over the next month, we decided to Adepti-start them instead of kickstarting. We thought it would be a cool way to release 4 different terrain styles. We have sold a few of the bucket kit through our facebook promotion of it pre-adepticon and they were a pre-order price of $60, sadly you have to get your own 5 gallon bucket from home depot or something for $3, I just could not figure out how to mail them all together
Thanks for the interest and if you have any other questions feel free to pm me.