Don't ask what SALT stands for, don't ask where I overheard or read that it was a convenient ressource for megaprims of any size ... All I can tell you is it is a HUD attachment that is miraculously able to find and deliver almost all conceivable dimensions of over-sized prims - and if the exact dimension isn't in the repository you are presented with a list of similarly dimensioned prims to choose from.
As you can see in the image above I found the right mega-prim to finally support the Skyloft and thus prevent it from magically floating at 250m altitude. (Roboexotica office got also anchored to it.) Even if this may still not be physically convincing, I consider it a psychologically useful grounding ... The platforms up there are no longer "hidden somewhere in the sky" but "at the other end of that pole, beyond the clouds". Or whatever.