I've a quick question for those of you who've purchased Kotobukiya sets before. What is the quality of these pieces? They look outstanding, but are they durable and heavy -- does the plastic feel sturdy -- or are they fairly light and feel thin and hollow? I'm very interested in the McQuarrie concept piece, but for $170 to $200, I want some heft on this set to help justify the expense. BBTS has a shipping weight of 8.4 lbs for the McQuarrie set, but I don't know how much of that weight is claimed by the boxes & packing material. Thank you for any input.