I'm in the process of making a Braggoth Hammer battalion. I already had 4 mournfangs, so I wanted to make next models a bit different to get some variety. Currently I have 3 gore gruntas, but when I get the other 3, I'll make something similar with them. If the result turns out okay.
I want to make some of them in rearing position, although repositioning their legs is much harder than it seemed. But repositioning the riders is even more difficult, because if a mount rears you lean forward. And I cannot turn them so, their gutplate gets in the way. I haven't found a solution for that yet.
Otherwise I just kitbashed a lot: saddles and weapons from Stonehorn, something from gore gruntas etc.