We all know what these squat abhumans are or were, mentioned only briefly and not by name, in the imperial Guard Codex. (Page 24, if you're interested.)
I've been giving it some thought this morning, as I had my breakfast, and came up with some initial ideas for a nice little homebrew of how to represent them.
I have more ideas than I have time to type up now, but here's some teaser stuff...
Unit; 6-18 Warriors
WS BS S T W I A Ld Sv
4 3 3 4 1 2 1 8 5+
Wargear; Lasgun, Flak Armour, Frag Grenades, Close Combat Weapon
Exchange Lasgun with;
Equip the unit with;
One model in every three may replace his Lasgun with;
Plasma Blaster 18" S6 AP3 Rapid Fire
Ion Carbine 18" S4 AP6 Assault 3
Ion Mortar 24"S5 AP5 Heavy 3, Barrage
Ion Rifle 36" S6 AP4 Heavy 3