This is a bogie flat/bolster that I built several years ago. The bolsters are wood and are removable; being held in place by 2 spigots on the bottom of each bolster which locate into sockets in the wagon bed. (the bolsters are even interchangeable!). Similarly the stakes are also removable and can be inserted into flush square sockets in the bolsters.
The lashing rings are the aforementioned jewellery jump-rings and small split pins.
The general construction is of Plastruct around a bed of 6mm x 12mm strip wood, and the hand brake mechanism and truss rods are built up from brass strip, tube and rod.
The bogies came from 'stock'; haven't a clue who's they are or how I came by them, I've had them for years, but they are plastic moldings and are for 45mm gauge wheel-sets, although I seem to remember that they may have had Hornby 00 type coupling fitted originally.
The Playmobil coach in the background was in original condition at the time, but has since had a repaint, end doors, glazing and brass handrails fitted like the one in front of it.
The photo below shows it without a load coupled to a PM chassis/scratch built body brake van . The push-pull set is in the background.

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