Oh wow that all sounds amazing, I can't wait!

You played the innocent there saying you didn't really know what direction to take the army, but you've got the makings of a very nice standard guard army.

If you've got 5 chimeras and a good few squads how about making it a specialised armoured fist army? Everyone can count as veterans and be mounted in their own transport which gives you a move of manoeuvrability and a fair bit of firepower. Rough riders act as scouts and you've got the leman russes for heavy support. That could work out very well!