Dog trailer for motorcycle

So my intent is to build a trailer to tow behind my Harley. The trailer will offer a little storage for my things as well, however the main purpose will be to haul my 2 medium sized dogs around. I have only started with this idea and nothing is written in stone yet. I have included a rough picture. The more I think about it I will only have a lid on my storage area, the dogs will not have a lid and they will get in and out from the door on the back. I am looking for design input from you out there. Bounce some ideas off me please. Also would it look cool if it was in the shape of and looked like a miniature sized horse trailer?