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I'm a huge Lego collector but I have a few Duplo blocks as well, plus some huge Megablok Maxi size that my wife bought. I can connect Lego above or below Duplo, which is great -- especially for building huge structures. I can snap Megablok Maxi above my Lego or Duplo, but I'd like to snap them below. The height/width dimensions line up, but the huge rounded pegs above Megabloks won't be accepted by Duplo above. Does anyone know of Lego or Duplo pieces that will accept Megabloks below? I had success with the Duplo Thomas Trains lid/building-piece... it accepts Megabloks. Any similar pieces would be helpful.