...take it you never had the joy of big boy's Meccano plaster(?) - or Bridging as the Gods of Bridging would phrase it - I wonder how many have joined the RE having started their love of engineering from playing with their Meccano kits?
Yesss ... Bayko, or whichever. Irritating plasticky stuff. And you could never get the sodding roof to slot into place.
AND ... BrickPlayer, with trowel and floury-cement. That was serious. Proper bricks and metal window frames.
Meccano was the Daddy, but my Daddy tended to monopolise it for himself.