Yes you are very right... unfortunately I had already boiled them at the time of reading this and yes, it made them into a very thick pulp which was almost impossible to drain the juice from
After about an hour of squeezing them through a pair of tights i managed to get 2 litres out of 4kg apples but as you said it was quite thick so i decided to add water as my only option.... also a cup of sugar to bring the gravity back up. I like strong drinks so hoping it will be at least 6-7% i guess it wont make a very good cider but oh well, for me this is more an experiment of the science than anything, next time im sure i will do better.
My biggest concern right now is that it doesnt seem to be doing much apart from a very thin layer of foam on top. maybe because i stupidly started it at the beginning of the night time so the juice might have been too cold to start fermenting. It was around 30*C when I put the yeast in, then for the next 12 hours I can guess the temp was around 10*C. How can I know if it is actually working or not? Maybe I should add more yeast at the start of a day where I will be at home all day with the heating on.