Lol best I could do at work, as far as upgrades go I like deflector shield on kassa if a think she's going to come under pressure, I like experimental rocket on electrocutioners For a bit more ranged support. If I'm playing a ranged army and I think kassa is fairly safe from assassin's I don't put any upgrades on her, Just make sure she's hidden behind something, and I put an engineer in the electrocutioners for extra ranged attack options, card draw and survivability, a rail gunner is handy too. So my usual list goes like this-
Kassa okoye +25
Electrocutioners 10
Steel Legion 12
Rail gunner 2
Leaving me 1 scrip to pick either deflector shield or an engineer, being Abyssinia we get free prototypes anyway so the units get upgrades to play around with. It's not a big army but one I've had good success with against cotbm and kings empire.
Alot get surprised with the maneuverability of this army too so use that to your advantage, plus it won't take long for your opponents to realise against steel legion their titans are as tough as a wet paper bag so they will definitely target them, I use that so my electrocutioners can pick the strongest units and waste em.