Do335 may of been potentially a great piston fighter if the Germans had gotten their thumbs out and actually put some priority on getting it out, however it is something that doesn't meet the requirements for being added to AH, particularly when so many important WWII aircraft, and even AFVs, are not yet represented.
The Do335 was also the ugliest aircraft of WWII, in my opinion. It took work, but the Germans managed to outdo the French in Ugly.