I'm currently building a PT-60 (well I was building it, I had to stop do to location of my bench and my most recent injury), personally I'm in favor of trainers at the moment, I am a beginner and I would like to go in to aerial photography eventually so a trainer does well on both fronts, what trainer to do something that can take you sometime might be nice as to choose one that ill take a week or 2 would be no fun for you and wouldn't keep you busy for very long, personally even as a first timer I think the PT-60 is about 2 weeks of work if done correctly (I'm on 3rd month ) so enough of my blabber, I'd say something that you'll enjoy building and will take you a bit to build (what ever it is you build we'll learn a lot from it I promise)

Dave