Family trials guide?

[Sotnik]

Hi! Is there detailed info on Family Trials mode anywhere? In particular:
1) How difficulties differ?
2) Are items character-specific or available for all?
3) Are perks totally random or their probability depend on lvl? For instance, can I roll any perk as a starting bonus?
4) Do starting boons include all or have a limited range of possible ones?
5) What does the revolving round plate on the floor in the starting room do?
6) Is there a way to save before quitting the game?
7) Why to spend gems on chests? Boon chance?
8) What are the zyklus # with starting bonus rooms?