dont worry, my first Deathwatch helmet didnt Looked that perfect either. Dont worry the Pix speak for his own
Bo uses afaik the same Bootplate like the normal Grunts do. I just took a Jangostyle Boot-Template and cut its edges to a right angle. this the rest is just a glued rectangular plate with roundsanded edges on top
Somehow the Clone-Wars stuff is always muddy and seems like having thick crusts of Oil and Dirt on it even shineys and jedis XD So you may wanna put some black-brown waterbased paint on it and rub it off once dried.