Welcome to Librarium Online!
ok quick question i think i know the answer but i will ask anyway.
if im running a clan army death skulls in particular. and i choose imperial guard
sentinals as my common units (looted vehicle).
1.do i have to use the base cost for the model or the equiped cost with weapons weapons.
a. the base cost for a sentinal is under 51 pnts which would allow me to choose more than one in my army.
b. while if i add a laz cannon the pnt cost would go over 51 limiting my choice down to 1.
2. next question would be can i even choose sentials as looted vehicles?
You can't loot them without your opponents permission and as far as I know the cost + upgrades is counted for how many you can take.
'It's Irrational, It's Impossible, It's Against my Religion'
Sentinals are not normally a looted vehicle category, although you can field them with your opponents permission along with anything else in your imagination that you could concieve of looting. This however being said, assuming that you have been allowed to loot Imperial guard Sentinals, then I would have to say that your choices would be limited to one as the cost of upgrades also includes weapons and as such goes above the 51pts limit.