For the next part of the pack I was thinking of creating a corinthian style helmet that will lay on the top of the engineers head like the reference image. As well a blacksmith's hammer, tongs, maybe a shield for the engineers back.
Dohohoho, I merged the hair and the helmet today and created a 512x512 texture map for the whole mesh, it still has some messy seems and awkward spots I need to clean up. The model comes in at 2010 polygons which is a little too many for the TF2 workshop. *cricket* *cricket* Anyway I'll keep working.