Though it would be fun to add a trailer to my WST Optimus as he didn’t come with one, design is loosely based the MP-10 one and proportions based on the Hybrid Style one.
There are no moving parts so it doesn’t open but it still has a couple of tricks up its sleeve (or under it’s belly should I say) :
- storage slot for the gun
- removable leg stored which can be used when it is not connected to optimus
Both storage compartment are really tight so it's better to have a pointy object on hand to extract the accessories.
Wheels are not designed to move and should be glued
Trailer doesn't require any support if printed upside down :)