I'm not sure what scale, but the bigger the better. Maybe start with a 2' model depending on the scale.
I know there was a thread a while back detailing a build but I'm looking for something a bit better. I'm gathering photos and hopefully will someday start on some drawings. After seeing the series ender I thought it'd be awesome to have one. I think I'd really love a action fleet or Titanium scale one as well. I'd buy 3.