Thanks for all the comments
I probably should've replied to them sooner, but here goes:
Owen: you are completely right. I should get more of those parts.
Brickster: yes, chaos! Waagh!
I wanted to create some sort of 'desperate last stand' feel by putting very unlikely allies together in the magical army. Makes the threat of the invasion feel more real, imo. Looking back, I think I should've put the Trogdor on some kind of pedestal in the middle of the battlefield to serve as a point of focus. If you want closer pictures of some of the creatures don't hesitate to ask.