Deff Dreads are much better this edition--skorchas for infantry, klaws for everything else.
At 30PL there isn't much wiggle room. If you wanted more bodies, or walkers in this case, you could swap the stormboyz and 1 dread for 3 killa kans and another mek gun but you lose out on close combat potential.
The stormboyz seem a bit fragile, and with the rest of your army being mechanized they will be the focus of anti infantry fire if they cant get into
cc fast enough. Although I love how they have a jump pack dread to match them in your pictures
The mega armor is taking 2
PL more than a normal big mek would. Do you intend for him to get into
cc or is it just a precaution against deep strike an shoot armies? I am worried that his movement of 4 will not be enough to keep up with the dreads. Dropping the mega armor coul get you 2 more big gunz or 5 more stormboyz.
I think the list is almost as good as it's going to get with the 30PL restriction. Don't forget to kit out your units since gear is free in
PL--nob for stormboyz, kombi weapons on big mek and nob, etc.