Cheers, I am rather quite pleased with how that model turned out.
As for your second Question, all hits in the game, be it from shooting, magic or combat, are presumed to only hit once or hit one model at a time, unless its description states otherwise. So the answer to your question is that the Catapult’s Bullet will only hit one model in a unit or group of models. lol, but it will most likely kill them outright! And yes, if it did that to an entire unit, it would be a little OP 🙂
I had another look at those rules and it would be the easiest thing in the world to just make it a little clearer there. So the next chance I will make that edit. Thanks.
As for question three, you have found a little update has been sorted and going to be an update in the next version of the game.
As it stands at the moment, technically a Catapult can move and shoot without penalty. However, they should only be able to move or shoot, not both. Amazingly that one slipped under the radar for years. You see we never used to use them in our games, and all other war machines didn’t have a movement value. So this was not a problem until more recently when we started using catapults against the Elves a lot more.