I was granted access to the Prague Plane and Mat List. There will be lots of appropriate planes to fill out the scenario.
I have enough for six pilots, but need a few targets for the German side to shoot at. The list indicates there will be Sopwith 1 1/2 Strutters and R.E. 8s on hand (Photo-Recon planes), as well as a few more Albatros D.IIIs to give more Germans a chance to shoot down Albert Ball and Billy Bishop.
If we want, we can use a No-Man's Land map for Vimy Ridge, and some country maps for either side for maneuvering room will do very well for the mission. No need for a special map.