A few more updated photos of Muttly, he's turning out to be a beefcake of a Rooster.  I did some playing around with the chicken genetics calculator and he could be a BLRW mix, his laced parent would have had to have incomplete lacing, but that's not unusual in BLRW, and it doesn't take very much to take a bird that looks reasonably BLRWish (ie a poorly bred one), cross it with a New Hampshire and end up with a Muttly 
 
He was 5.5 months in these photos.  He has the tiniest hint of blue/black at the tips of some of his feathers in his body, that's the only remnants of his original color as a chick.