the pluss side is that i have around a 15-25 liter empty capacity!!

The bad news is i will not be able to brew until the end of the month at the earliest and i would ike something that is drinkable by the end of december.
I guess this means that i need something that is of a relative low OG .
I have the following grains available
Pale ( 14 kg)
dark crystal ( 1 kg)
light crystal (1 kg)
Torri wheat (1 kg)
black patent 500g
chocolate 500g
I have the following hps.
Goldings
styrian goldings
bobek
Northdown
challenger
fuggles
target
I will opt for either safeale 4 which i know and trust or the slurry of nottingham that has just finished fermenting a beer.
I have just made a batch of a play on the styrian stunner although i used bobek as well. this is a single malt brew and i would like something that gives another option.
Right now my christmas stocks are a full bodied hefty winter warmer at 7.1% ( 10 litres)
a styrian stunner type at about 4.8% ( 12 liters)
Oatmeal stout about 4.2% ( 5 litres)
I would like a 10-15 litre brewlength of something that is around the 3,7-8 mark that will be ready as fast as possible ( like within 3 weeks)
IS this doable and what would you suggest.
Thanks