The black base comes with the Revell kit, the shuttle is also Revell....all in 144th scale. I had to secure the Revell black/earth base to a square of birch plywood, as the black base alone is not that sturdy. I also felt I had to add another piece of aluminum tube to support the shuttle. I had hoped not to but it really does support everything else as built.
The model is quite fragile and large..... I still don't know what I'm going to do with it. It may be safest to hang it on strong fishing line from the ceiling. It looks good floating that way as well (I tried that).
I also amped up the colors in the photos so you could see it a little better, so in real life the model is a bit more subdued as far as the brightness of the colors.! I have yet to add the little black and white spots to the modules. Haven't figured that out yet. It was fun to build..yet the painting was a real PIA. Next to My Tamiya CVN-65 USS Enterprise its got to be the biggest conversation piece of all my models.