http://www.dakkadakka.com/dakkaforum/posts/list/14.page JForum - http://www.jforum.net List one:
Big Mek (Ammo Runt)
10x Grots
10x Grots
Big Guns - 3 Kannons, max krew, runtherd, 3 ammo runts
Big Guns - 3 Kannons, max krew, runtherd, 3 ammo runts
Big Guns - 3 Kannons, max krew, runtherd
Aegis Line w/ Quad Gun

59 T7 wounds with 4+ cover. Come at me, bro!

List two:
Big Mek (Kustom Force Field, Eavy Armor)
15x Grots
Deff Dread w/ 2 Skorchas, Grot Riggers, Armor Plates
3 Killa Kans w/ Skorchas
3 Killa Kans w/ Grotzookas

7 Walkers who are almost always obscured, have someone to repair them nearby, and can lay down ungodly amounts of templates.
]]> http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5935570.page http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5935570.page GMT CC.

Second list looks interesting. Don't count on that repair though]]> http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5935702.page http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5935702.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5935748.page http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5935748.page GMT
Aegis is good for killing fliers, but there are no fliers, and with a 3+ save you won't need the aegis cover either. You should also be camping in area terrain for free cover (same as Aegis if you gtg) and getting first strike in melee.

Get more Grots. Then I'd suggest getting a fighty character, but ofc challenge rules gak all over that.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5935879.page http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5935879.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5938235.page http://www.dakkadakka.com/dakkaforum/posts/preList/545430/5938235.page GMT