Not exactly Gunpla, but this is what I've been working on over the last couple weeks. It's 1/10 scale, so Greed herself is about the same size as the Avatar Fumina in the corner (so a head taller than a typical HG). Yeah, this is the single biggest kit I've done so far. The kit did come with 3 hex plates for display bases, but the big stand for the whale had holes for the display arms, so I just stuck them all together. Not sure if you can tell from the pic, but Greed is actually being held up by a display arm plugged into her back, because she can't stay balanced naturally on the whale's back.
I've been kinda tempted by this one in the past. I like the mecha-animals.
The support units can be combined, too! For instance, you can replace the whale's pectoral fins with the ray's wings, and the ray's tail can be replaced by the entire shark entirely. I chose to not do any of that, though, because I liked the visual impact of having all three out at the same time more.