Han in STA
Ithorian Commander
Lobot (1x Wookiee commando, Tusken Raider, AA)
R2 3PO
Rauntaun
Wicket
1x Wookiee Commando
3x AA
3x Tusken Raider
2x Ugo
15 activations plus Lobot

I'm not sure if this squad can even beat LV B&B.

I keep thinking that a rebel swarm at 150 must have a good version. I just have not seen it yet.

There is some great damage potential in there, but i would consider more stealth or high hit point units or your minis could easily be picked off by stormtroopers (particularly in B&B).

Han in STA 25
Ithorian Commander 11
Lobot (1x Wookiee commando 9, Gran Raider/Tusken 4, AA 7) 27
R2 3PO 18
Rauntaun 13
Wicket 8
1x Wookiee Commando 9
4x AA 21
2x Gran Raider/Tusken 8
Ugo 3

14 Activations (Then you have lobot's)

Gives you more stealth and a greater chance to assure your units make it in range as well as more damage output from the added AA. You can take the Tuskens for the extra attack value or the Grans for the added survivability.
All in all you sacrifice one satchel charge, 1 activation/attack, and gain opportunist and stealth and a more reliable attack compared to the tusken or ugo.

A rebel swarm seems fun, but maybe 200 is the place to do it where you can get more fodder and add in Leia, Hoth Commander. Or change it up to fit in Master Kota.

Is here Rauntaun really necessary? I mean, do this squad really need him?
P.S. I own him

The rebel swarm's weakness will always be disruptive but to maximize its damage potential, it would be best to use mostly AA's, but if you want some figs that can last a little while, perhaps use both Wookie Commandoes and AA's.

As i have posted in the past, I think that rebel swarm squads to better with Wookie Freedom Fighters; Hoth Commander leia; Rebel Leader; and mon cal techs