I cut the top off a postmix keg and attached it to a regular 50L keg, it works great.. have 2 of them now.
The total cost for making this up was $140 per keg, they are great, only trouble is they are heavy, very heavy! (lucky I have a forklift :D )
I put my kegs in the fridge and connect the gas at serving pressure (~80kpa) and let them sit in there for anywhere between a couple of weeks and a couple of months.
It gives them time to carbonate slowly and age/cold condition.
I split a double batch between two kegs and shook the first keg...
Since I have moved in to a 2 bedroom unit there is no beer garden here, just a small deck that just fits a small BBQ and a couple of chairs.. still it's good to go out there for a beer or two in the afternoon, not much to look at though.
Grolsch is one of my favorite beers and being a K&K person the brewcraft dutch lager with extra hallertau hops in it comes very close to it after 6 weeks of fermenting/racking and then 3 months CC'ing.
It takes a long time, but very well worth it, got 50Ltrs of it ready to go soon and I can't wait!
I keg, so that has never been a problem for me.. but I would guess once your beer warmed up the the yeast would come back and be able to carbonate your beer, they are tough little buggers thats for sure.
When I make a lager I like it to be clear, here is my method for getting a crystal clear lager.
Brew for 2 weeks @ ~10C
Rack and add finings for 2 weeks @ ~12C
Rest for 2 days @ ~16-18C
Cold Condition for as long as you can (2-3 months is good) @ ~2C
It is a long drawn out process but when you...