I have a book on ROA/RONA (Blazejos - "Armia Wlasowa"
Organisation was as in Wehrmacht, except for weaponry. Osttruppen used mainly russian weaponry as they were familiar with it (Mosin rifles, PPS/PPD submachineguns, DP and Maxim MGs, 82mm mortars, 76.2mm infantry guns and 45mm ATGs).
Armour existed only in large units - RONA and ROA had a couple (10-20 ?) T-34s, StuGs and soviet armoured cars.
There was a myriad of Osttruppen formations ("normal" Osttruppen, ROA, RONA, RNNA, RNA, Waffen SS Ukrainan and Belarussian troops, Don Cossacks... the list goes on). Any accurate portrayal is almost impossible - best we can have is to stick to existing Osttruppen, maybe rearm them with more soviet weaponry.