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This is a custom landing Pad for the original and reproduction model kits of Moonbase Alpha. The original model kit only came with 3 pads. This version also has the Eagle boarding Gangway. This pad is roughly 2/3 the size of the ones that came with the kit but scale to the rest of the moonbase properly. Note: The Eagles in the original kit were also oversized, so they will look too large on these bases.
I also have the original scale versions, which are to scale with the bases that came with the model kit and the Eagles. (It should have come up in the same search. If not, try just searching on moonbase landing pad)