No, 2 to 5 squads of guardsmen(so 50 man infantry squad), plus the compulsory Platoon Command Squad, and then 0-1 conscripts squads, 0-5 Heavy weapon teams, 0-2 special weapon squads (don't bother), all as 1 troop choice.
So you could have:
Platoon Command Squad: w/flamers + Chimera
x5 Infantry Squads, w/flamers, autocannons, commissar
x5 HWS's w/lascannons
x2 SWS w/melta + Chimeras
x1 Conscript Squad
This would be 1 troop choice. As an allied detachment you can take 2 platoons of this size if you want, since allies can use 2 troop choices. So you can have over 200 models in theory in your allied detachment, but have fun moving all of those!