The only add-on to these planes were some machine gunners (cannon gunners on this case!). In order to speed building and painting I painted the glasses in a Rapid Fire!/Tintin style.
From AZUR comes this Maryland M 167. It has some pieces in resin which frankly are unnecessary and could have made the model much less expensive. Not sure but I think this model is an ex FROG and pretty old and thus the need for AZUR to add some resin parts to revamp it.