Steed of Slaanesh

Been waiting to get one of these into the army. But it does pose a few problems. Firstly. I have to convert a rider. Which isn't the easiest thing to do due to the size of the Steed, it's too thin bodied for a lot of the standard mounted legs and the legs get in the way of the smaller ones (such as Dark Elf Knight legs). So that'll be a challenge. The next problem after that will be the colour scheme of the army and fitting a steed of slaanesh into it. I want to put this into my army for the upcoming fantasy tournament at my gaming club so need to work fairly quickly as it's early August and I have quite a bit to finish in time for it!