Gripping Beast Later Roman Cataphracts

I say "Later" Roman but these could fit in pretty much anywhere from the time of Hadrian until the 5th or maybe 6th century.

I've mounted them in groups of three to give me two units of 6 riders, which I can use for Sword and Spear or, more likely, the new Midgard rules from TFL. 

I've already got my Midgard rules and I'm looking at creating a Late Roman army using my already quite large Gripping Beast collection of Late Romans, which you can find elsewhere on the blog by searching for them. I've got more cavalry to get assembled and painted, which would give me more heavy cavalry and some horse archers. I'm also painting up some Saxon Thegns who I think will serve perfectly well as Germanic foederati with a few Roman-style shields mixed in with the round ones and some suitably generic shield transfers. After all, they are all just blokes in mail with shields and spears.