many thanks so far. What I found out until now to make it a May 2018 Parade vehicle is to build the kit 09565 which I have with the optional parts for the 2017 option, plus stowage boxes on the fenders and the rear of the OHWS from the 09506 kit, plus part S16, which is only mentioned in the 09515 kit (it is a support pole behind the OHWS).
The instructions would help a lot to find out which additional parts are needed for the stowage boxes (like mounts, etc.).
Barrels from ABER and MC1200 paint from Mr. Paint are ordered. Replacement tracks not yet (I like workable ones which are easiest to attach after complete assembly, painting, weathering). Need to decide if with or without rubber pads.