1940s STICS Construction Toy - Make Your Own Field Gun

An unopened 1940s packet of
"PLASTIC PUZZLE TOYS  ON WHEELS   MADE IN HONG KONG"
Little plastic "Stics" - 2.5cm long - and 2 wheels - can be made into...
a Tommy Gun, Wheelbarrow, Field Gun and Porters Truck
with full diagrams on the reverse of the packet.
Who needs Minecraft when you can have a packet of STICS...?
I found a few boxes of these in an old toy warehouse I cleared.