I used the excellent Crusader miniatures for my Dragon Portesham troops, so that I can give the German player a taste of being on the recieving end of two MGs.
A friend of mine printed an excellent Somua S35 as support, to counter and Panzer forces that accompany the Germans. I also have a Hotchkiss 25mm anti tank gun as well.
Having also received just recently a WW1 observer team from Scarab miniatures, which gives me my mortar fire controller, and will also look at getting the ubiquitous French 75mm for some serious oomph and a 60mm mortar. Being motorised the 75mm should have the pneumatic wheels not the spoked of the horse drawn model.
Picking the Dragon porte limits me on figure poses as they didn't wear the long great coat so difficult to pick up those extra support figures.