Barritus :- I'd agree that you should be able to organise the Thessalians into any command you like if you don't take the Ally General . Also agree that yoiur Psiloi are in proportion to the Thessalian nobles and (optional) Ally General only.
The followers is an interesting one. I'd argue that they should be in proportion to the cavalry (i.e. not the chariots or Thessalians), but the phrasing is Irr Cv(O). This was a snag for me when I took the army to Roll Call. For the record I used it with Paionian allies in 275 BC, organised as follows :-
CinC Wb(S), 18 Wb(S), 2 Irr Cv(O) chariots, 2 Irr Cv(I) followers + 2 Army Baggage - 28 ME
Sub (Wb(S)), 18 Wb(S) + 2 Army Baggage - 24 ME
Sub (Cv(O) chariot), 6 Irr Cv(O), 7 Irr Cv(I), 6 Irr Ps(I) + 2 Army Baggage 22 ME
Paionian Ally General (Irr Ps(S)), 4 Irr Lh(O), 6 Irr Ax(O), 4 Irr Ps(S), 1 Irr Ps(O), 5 Irr Ps(I), 2 Command Baggage - 18 ME
You either win or lose with this army - no draws ....
I lost to Indo-Greeks (stomped by elephants after I rolled high and had to deploy first)
, then beat a Han Chinese army, lost to Attalid Pergameme
and beat Early Carthaginians