Believe it or not, this is actually a project I've wanted to do for ages. Whilst I realise the limitations to a list such as this, I feel that it is capable in many other ways from a conventional Marine list and remarkably fluffy.
1000 points, Baal Strike Force
Captain
~ Artificier Armour
~ Combi-melta, relic blade, melta bombs, auspex
~ Storm shield or Veritas Vitae
~ Warlord
Command Squad
~ Meltagun (3)
~ Drop Pod
Scout Squad (10)
~ Sniper rifle (8)
~ Heavy bolter with hellfire shells
~ Boltgun, melta bombs
Scout Squad (10)
~ Bolt pistol, close combat weapon (7)
~ Shotgun (2)
~ Veteran Sergeant, melta bombs, bolt pistol, chainsword
Scout Squad (10)
~ Bolt pistol, close combat weapon (7)
~ Shotgun (2)
~ Veteran Sergeant, melta bombs, bolt pistol, chainsword
Scout Squad (10)
~ Boltgun (9)
~ Boltgun, melta bombs
Scout Bike Squadron (3)
~ Astartes grenade launcher (2)
~ Combi-grav, melta bombs
Tarantula Sentry Gun Battery (2)
~ Twin-linked lascannon, camo netting (1)
~ Multi-melta, searchlight, camo netting (1)
Options
Captain will arrive with the Command Squad as this is the best way to keep up with the Scouts. Torn between a storm shield (with this being my only real "beat" squad, I'll probably need to tank stuff) and the Veritas Vitae for that tactical advantage (thinking here to Infiltrate the Tarantulas, possibility of getting Night fight, Stealth in Ruins across the board, and/or other such stuff). Bikes will either Outflank or Scout to make use of the combi-grav. Not sure what best synergises with the grenade launcher though...
I've also opted for a BSF to make use of the two (possibly four) combat Scout Squads. Whilst I could use a CAD with potentially eight Objective Secured Squads, I don't feel that they have the durability to pull it off, even if the stars align and I get Stealth everywhere.
One interesting twist is that I could trim the "shooty units" from above and use it in conjunction with the 10th Company Task Force from Codex: Space Marines. This could represent the "Elite Scouts" of the BA army and I could even use Telion to represent Captain Borgio of our 10th Company.
Thoughts?