I have a frame mounted steco (Azor/Steco Pickup frame mounting front rack) on my Opafiets with a small wood crate stuck to it. As mentioned previously, frame mounted handles loads much more comfortably than bar or fork mounted and a load up front is a bit better than in back (though this may be personal opinion).

Even so I still kind of prefer nothing up front so for lighter stuff I just use the rear rack and have a small wood crate for there as well that I can just throw my computer bag in. This works well on a step-thru like an opafiets or Gr8 but might be a problem for some people getting on a step-over.