I'm looking to build a couple of 3k armies to demo the game to new player(s) locally. IG vs Orks are classic armies for this and I'd like to use armies that show the variety of units and tactics in the game and the demonstrate the playstyle of the two armies. I've thrown together a couple of army lists below, do these look reasonable? Any suggestions for changes?

I will probably play a very small quick demo game beforehand to demonstrate the basics rules also.

Steel Legion:

REGIMENTAL HQ [550]
Supreme Commander, 12 Infantry, 7 Chimera, Hydra

MECHANISED INFANTRY COMPANY [450]
Commander, 12 Infantry, 7 Chimera, Hydra

INFANTRY COMPANY [375]
Commander, 12 Infantry, Fire Support Platoon (4 Fire Support), Sniper

ROUGH RIDER PLATOON [150]
6 Rough Riders

ARTILLERY BATTERY [250]
3 Basilisks

SUPER-HEAVY TANK PLATOON [200]
Shadowsword

THUNDERBOLT FIGHTERS [150]
2 Thunderbolts

WARHOUND TITAN [275]

STORM TROOPER PLATOON [350]
8 Storm Troopers, Valkyrie Transport

FLAK BATTERY [150]
3 Hydra

SENTINEL SQUADRON [100]
4 Sentinels

Orks:

WARBAND (BIG) [350]
4 Nobz, 12 Boyz, 4 Grotz

WARBAND [200]
2 Nobz, 6 Boyz, 2 Grotz

LANDA [200]

FIGHTA SQUADRON [150]
3 Fighta Bomba

MEKBOY STOMPAMOB [475]
3 Stompa (2x Big Gun, 1x Kombat 'Ammer), Supa Stompa (3x Soopaguns)

KULT OF SPEED (BIG) [350]
3 Buggy, 13 Skorcha

BLITZ BRIGADE (BIG) [250]
6 Flakwagon, 2 Gunwagon

BLITZ BRIGADE (BIG) [250]
6 Flakwagon, 2 Gunwagon

WARBAND [340]
2 Nobz, 6 Boyz, 2 Grotz, 4 Battlewagon

MEKBOY GUNMOB (BIG) [275]
10 Big Gunz, Oddboy - Super Zzap

STORMBOYZ WARHORDE [150]
6 Stormboyz