For this reason I decided to make a strong stout -- same amount of extract, but less water to heat up on my weedy cooker. Too late for Christmas, obviously, as it will take a good while to mature, but I can always bottle condition it in small bottles and try it next Christmas!
Heat 6L water
Steep 200g chocolate malt at 75 for 30 mins
+1 tbsp fresh ground coffee
Mixed 70g candy sugar with some chocolate malt wort and allowed to melt/bubble.
Added another 2L water and returned all chocolate malt liquor to the pan.
Added 1/4 tsp gypsum
Added 1.4 kg pale LME
Added 10g Northern Brewer - 80min
the original gravity was 1082

on the 17th it was down to 1042 and on the 19th 1036. It already tastes pretty good, but will need to finish fermenting and then mellow for a good long time. What gravity should I expect this to reach?